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Entity Names Starting With The Letter P	Structure	Reactions Forming	Reactions Using	Wikipedia	NIST
P	P	3	20	Wikipedia	NIST
P	P Red	1	1	Wikipedia	NIST
P (proline)		1	1	Wikipedia	NIST
P2	P₂	2		Wikipedia	NIST
P2H6	P₂H₆			Wikipedia	NIST
P2O3	P₂O₃	1	2	Wikipedia	NIST
P2O5	P₂O₅	3	8	Wikipedia	NIST
P2S3	P₂S₃		1	Wikipedia	NIST
P2S5	P₂S₅	1		Wikipedia	NIST
P3-	P^3–		10	Wikipedia	NIST
P4	P	3	20	Wikipedia	NIST
P4O10	P₂O₅	3	8	Wikipedia	NIST
PA		3	4	Wikipedia	NIST
Pa	Pa				NIST
Palladium	Pd	3	6	Wikipedia	NIST
Palladium alloy	Palladium Alloy				NIST
Palladium dichloride	PdCl₂	2	5	Wikipedia	NIST
Palladium gold	Palladium Gold				NIST
Palladium hydride	PdH	1		Wikipedia	NIST
Palladium on barium sulfate	Pd on BaSO₄		8		NIST
Palladium on CaCO3 poisoned with Pb	Pd + Pb on CaCO₃ ^{Lindlar Cat.}		1	Wikipedia	NIST
Palladium on carbon	Pd on C		39		NIST
Palladium white gold	Palladium White Gold			Wikipedia	NIST
Palladium(II) bromide	PdBr₂				NIST
Palladium(II) chloride	PdCl₂	2	5	Wikipedia	NIST
Palladium(II) fluoride	PdF₂				NIST
Palladium(II) hexafluoropalladium(IV)	Pd[PdF₆]				NIST
Palladium(II) iodide	PdI₂				NIST
Palladium(II) ion	Pd²⁺		4		NIST
Palladium(II) oxide	PdO			Wikipedia	NIST
Palladium(IV) fluoride	PdF₄				NIST
Palmitic acid	CH₃(CH₂)₁₄COOH	6		Wikipedia	NIST
Palmitoleic acid	Palmitoleic Acid			Wikipedia	NIST
Paracetaldehyde		1		Wikipedia	NIST
Paracetamol				Wikipedia	NIST
Paraffin	Kerosine	1		Wikipedia	NIST
Paraformaldehyde	(CH₂O)_n	1	1	Wikipedia	NIST
paraHydrogen	↑H–H↓			Wikipedia	NIST
Paraldehyde		1		Wikipedia	NIST
Paramorphine				Wikipedia	NIST
Paraperiodic acid	H₅IO₆	3	1	Wikipedia	NIST
Paris red	Pb₃O₄			Wikipedia	NIST
Pb		6		Wikipedia	NIST
Pb(C2H5)4	Pb(CH₂CH₃)₄	1		Wikipedia	NIST
Pb(CH2CH3)4	Pb(CH₂CH₃)₄	1		Wikipedia	NIST
Pb(MnO4)2	Pb(MnO₄)₂	1			NIST
Pb(N3)2	Pb(N₃)₂	2	1	Wikipedia	NIST
Pb(NO3)2	Pb(NO₃)₂	1	2	Wikipedia	NIST
Pb(OAc)2	Pb(CH₃COO)₂	1		Wikipedia	NIST
Pb(OAc)4	Pb(OCOCH₃)₄	2		Wikipedia	NIST
Pb2+	Pb²⁺	3	14		NIST
Pb2O3	Pb₂O₃				NIST
Pb3(PO4)2	Pb₃(PO₄)₂	1			NIST
Pb3O4	Pb₃O₄			Wikipedia	NIST
Pb4+	Pb⁴⁺	1	2		NIST
PbBr2	PbBr₂	1		Wikipedia	NIST
PbCl2	PbCl₂	1		Wikipedia	NIST
PbCl4	PbCl₄		1		NIST
[PbCl6]2-	[PbCl₆]^2–	1			NIST
PbCO3	PbCO₃	1		Wikipedia	NIST
PbCrO4	PbCrO₄	1		Wikipedia	NIST
PbF2	PbF₂	1		Wikipedia	NIST
PbF4	PbF₄		1		NIST
[PbF6]2-	[PbF₆]^2–	1			NIST
PbI2	PbI₂	1		Wikipedia	NIST
PbNa	PbNa		1	Wikipedia	NIST
PbO	PbO	1	3	Wikipedia	NIST
PbO2	PbO₂		4	Wikipedia	NIST
PBr3	PBr₃	2	2	Wikipedia	NIST
PBr5	PBr₅	2		Wikipedia	NIST
PbS	PbS	1		Wikipedia	NIST
PbSO4	PbSO₄	1	1	Wikipedia	NIST
PCC			2	Wikipedia	NIST
PCl3	PCl₃	2	19	Wikipedia	NIST
PCl5	PCl₅	1	9	Wikipedia	NIST
PCl5(g)	PCl₅(g)			Wikipedia	NIST
Pd	Pd	3	6	Wikipedia	NIST
Pd on BaSO4	Pd on BaSO₄		8		NIST
Pd on C	Pd on C		39		NIST
Pd on CaCO3/Pb	Pd + Pb on CaCO₃ ^{Lindlar Cat.}		1	Wikipedia	NIST
Pd2+	Pd²⁺		4		NIST
PdBr2	PdBr₂				NIST
PdCl2	PdCl₂	2	5	Wikipedia	NIST
PdF2	PdF₂				NIST
PdF4	PdF₄				NIST
[PdF6]2-	[PdF₆]^2–				NIST
PdH	PdH	1		Wikipedia	NIST
PdI2	PdI₂				NIST
PdO	PdO			Wikipedia	NIST
Pd[PdF6]	Pd[PdF₆]				NIST
Peacock ore	Cu₅FeS₄		2	Wikipedia
Peanut oil	Peanut Oil		2	Wikipedia
Pearl ash	K₂CO₃	4	2	Wikipedia	NIST
Pearson borderline Lewis acid (generic)				Wikipedia
Pearson borderline Lewis base (generic)				Wikipedia
Pearson hard Lewis acid (generic)				Wikipedia
Pearson hard Lewis base (generic)				Wikipedia
Pearson soft Lewis acid (generic)				Wikipedia
Pearson soft Lewis base (generic)				Wikipedia
Pectolite	NaCa₂Si₃ O₈(OH)			Wikipedia
Penbritin				Wikipedia	NIST
Penicillin (generic)				Wikipedia
Pent-1-ene		1	2	Wikipedia	NIST
Pentaaquahydroxychromium(III) ion	Cr(H₂O)₅(OH)]²⁺	2			NIST
Pentaaquahydroxyiron(III) ion	[Co(NH₃)₆]²⁺	1			NIST
Pentaaquathiocyanatoiron(III) ion	[Fe(H₂O)₅(SCN)]²⁺	1			NIST
Pentaaquaoxovanadium(IV) ion	[VO]²⁺ [VO(H₂O)₅]²⁺	3	3		NIST
Pentacene				Wikipedia	NIST
Pentadecane			1	Wikipedia	NIST
1,4-Pentadiene					NIST
Pentadieny FMO (generic)
Pentadienyl anion					NIST
Pentadienyl cation					NIST
Pentadienyl radical					NIST
Pentaerythritol		1	1	Wikipedia	NIST
Pentaerythrityl tetranitrate		1	1	Wikipedia	NIST
Pentafluoroiodine	IF₅	2	3	Wikipedia	NIST
Pentagonal bipyramidal molecular shape (generic)				Wikipedia
Pentahydrocobalt(I) ion	[CoH₅]^4–		1		NIST
Pentalene				Wikipedia	NIST
Pentalene dianion				Wikipedia	NIST
Pentamethylene		2		Wikipedia	NIST
Pentan-1-ol			2	Wikipedia	NIST
Pentan-2-ol		1	1		NIST
Pentan-2-one		1	5	Wikipedia	NIST
Pentanal		1	3	Wikipedia	NIST
Pentane		3		Wikipedia	NIST
2,4-Pentanedione		2	2	Wikipedia	NIST
2,4-Pentanedione anion			1	Wikipedia	NIST
Pentanenitrile		1			NIST
Pentanoic acid		3		Wikipedia	NIST
1-Pentanol			2	Wikipedia	NIST
2-Pentanol		1	1		NIST
2-Pentanone		1	5	Wikipedia	NIST
Pentasodium triphosphate		1		Wikipedia	NIST
Pentasulfide dianion	[S–S–S–S–S]^2–				NIST
Pentatin dianion					NIST
1-Pentene		1	2	Wikipedia	NIST
1-Pentyl radical		2	2		NIST
Peptide (AS/A2 generic)		1	1	Wikipedia
Per-Oxygen Oxidising Agent (generic)
Peracetic acid	CH₃COOOH	3	4	Wikipedia	NIST
Perbromate ion	[BrO₄]^–		1	Wikipedia	NIST
Perchlorate ion	[ClO₄]^–		5	Wikipedia	NIST
Perchloric acid	HClO₄	4	1	Wikipedia	NIST
Perchloroethylene	Cl₂C=CCl₂	4		Wikipedia	NIST
Perchloromethane	CCl₄	11	5	Wikipedia	NIST
Perfluoroethane	C₂F₆	1		Wikipedia	NIST
Perfluoroethylene	F₂C=CF₂	1	1	Wikipedia	NIST
Perfluoromethane	CF₄	4	1	Wikipedia	NIST
Period 1 element (generic)	Period 1 Element			Wikipedia
Period 2 element (generic)	Period 2 Element			Wikipedia
Period 3 Chlorides (AS/A2 generic)
Period 3 Element (AS/A2 generic)				Wikipedia
Period 3 element (generic)	Period 3 Element			Wikipedia
Period 3 Oxides (AS/A2 generic)
Period 4 element (generic)	Period 4 Element			Wikipedia
Period 5 element (generic)	Period 5 Element			Wikipedia
Period 6 element (generic)	Period 6 Element			Wikipedia
Period 7 element (generic)	Period 7 Element			Wikipedia
Periodate ion	[IO₄]^–		1	Wikipedia	NIST
Periodic acid	H₅IO₆	3	1	Wikipedia	NIST
Periodic acid, para	H₅IO₆	3	1	Wikipedia	NIST
Perlon®		1		Wikipedia	NIST
Permanganate ion	[MnO₄]^–	2	14		NIST
Peroxide anion, organic (generic)	[ROO]^–		1
Peroxide ion	^–O–O^–		6	Wikipedia	NIST
Peroxide, organic (generic)	ROOH	2
1,4-Peroxido-p-menthene-2		1		Wikipedia	NIST
Peroxodisulfate(VI) ion			4		NIST
Peroxodisulfuric acid		2	1		NIST
Peroxycarboxylic acid (generic)		1	2
Peroxymonosulfuric acid		2	2	Wikipedia	NIST
Perspex		1		Wikipedia	NIST
Persulfuric acid		2	2	Wikipedia	NIST
Perxenate ion	[XeO₆]^4–	1		Wikipedia	NIST
Perylene			1	Wikipedia	NIST
PET	Terylene	2		Wikipedia	NIST
Petalite	LiAlSi₄O₁₀		1	Wikipedia
PETE	Terylene	2		Wikipedia	NIST
Pethidine hydrochloride				Wikipedia	NIST
PETN		1	1	Wikipedia	NIST
Petrol	Gasoline	4		Wikipedia	NIST
Petroleum	Crude Oil		13	Wikipedia
Pewter	Pewter			Wikipedia	NIST
PF3	PF₃	2	1	Wikipedia	NIST
PF5	PF₅	3	1	Wikipedia	NIST
[PF6]-	[PF₆]^–	1			NIST
pH indicator (generic)	Acid-base Indicator			Wikipedia
Ph2NH		1	1	Wikipedia	NIST
Ph3COH		1		Wikipedia	NIST
[Ph3C]+			2		NIST
[Ph3C]-			2	Wikipedia	NIST
Ph3P		1	4	Wikipedia	NIST
Ph3PO	(C₆H₅)₃P=O	1		Wikipedia	NIST
Pharmaceutucal Agent (generic)				Wikipedia
PhAsH2		1			NIST
PhBr		4	1	Wikipedia	NIST
PhCH2Br		2	1	Wikipedia	NIST
PhCH2Cl		1		Wikipedia	NIST
PhCH2CN				Wikipedia	NIST
PhCH2Li					NIST
PhCH2NH2		1		Wikipedia	NIST
PhCH2OH		5	1	Wikipedia	NIST
[PhCH2]+			4		NIST
PhCH3		6	16	Wikipedia	NIST
PhCH=CH2		2	4	Wikipedia	NIST
PhCH=CHPh			1	Wikipedia	NIST
PhCHO		2	6	Wikipedia	NIST
PhCl		5	3	Wikipedia	NIST
PhCN		2	3	Wikipedia	NIST
PhCOCl			1	Wikipedia	NIST
PhCOMe		3	2	Wikipedia	NIST
PhCONH2				Wikipedia	NIST
PhCOOH		6	2	Wikipedia	NIST
PhCOOR				Wikipedia
[PhCOO]-		2	2	Wikipedia	NIST
[PhCO]+			3		NIST
Phe		1	1	Wikipedia	NIST
Phenakite	Be₂SiO₄		1	Wikipedia
Phenanthrene		1		Wikipedia	NIST
Phene		11	42	Wikipedia	NIST
sec-Phenethyl alcohol		1	1		NIST
Phenol		8	10	Wikipedia	NIST
Phenol (generic)		1	1	Wikipedia
Phenol red	Phenol Red			Wikipedia	NIST
Phenolphthalein	Phenolphthalein			Wikipedia	NIST
Phenothiazine				Wikipedia	NIST
Phenoxide ion		2	7		NIST
Phenoxide ion (generic)		1	1
Phenyl acetate		1			NIST
Phenyl alkyl ketone (generic)		4	3
Phenyl amide anion			1	Wikipedia	NIST
Phenyl ammonium ion (generic)				Wikipedia
Phenyl anion			11	Wikipedia	NIST
Phenyl anion (generic)
Phenyl arsine		1			NIST
Phenyl arsine anion			1		NIST
Phenyl azo (generic)		1
Phenyl bromide		4	1	Wikipedia	NIST
Phenyl carbenium ion			4		NIST
Phenyl cation			4		NIST
Phenyl chloride		5	3	Wikipedia	NIST
Phenyl cyanide		2	3	Wikipedia	NIST
Phenyl ester (generic)		4	2
Phenyl ethanoate		1			NIST
Phenyl ether					NIST
Phenyl ether (generic)		3
N-Phenyl hydroxylamine		1		Wikipedia	NIST
Phenyl iodide		3		Wikipedia	NIST
Phenyl lithium		2	2		NIST
Phenyl nitranion			1	Wikipedia	NIST
Phenyl phosphine anion					NIST
Phenyl propyl ketone		2			NIST
Phenyl selenenyl bromide		2			NIST
Phenyl selenium cation			1		NIST
Phenyl silane		1			NIST
Phenyl silyl anion			1		NIST
Phenyl telluride		1			NIST
Phenyl(methyl) radical
Phenyl(methyl)bromide		2	1	Wikipedia	NIST
1-Phenyl-1,1,2,2-tetracyanoethane			1		NIST
1-Phenyl-1-butanone		2			NIST
(+/-) 1-Phenyl-2-aminopropane				Wikipedia	NIST
2-Phenyl-2-methylbutane		1			NIST
3-Phenyl -2-propen-1-ol		2		Wikipedia	NIST
Phenylacetylene		1		Wikipedia	NIST
Phenylacetylide anion			1	Wikipedia	NIST
cis beta-Phenylacrylic acid		1			NIST
trans beta-Phenylacrylic acid		1		Wikipedia	NIST
Phenylalanine		1	1	Wikipedia	NIST
Phenylalanine, deprotonated			1	Wikipedia	NIST
Phenylalanine, protonated		1		Wikipedia	NIST
Phenylamine		8	8	Wikipedia	NIST
Phenylammonium ion		2			NIST
Phenylbenzene		2		Wikipedia	NIST
4-Phenylbutanoic acid			3		NIST
4-Phenylbutyric acid			3		NIST
Phenylcyclohexane		1			NIST
Phenylcyclopropane		1			NIST
1,4-Phenylenediamine		2			NIST
N-Phenylethanamide		2	1	Wikipedia	NIST
1-Phenylethanamine		1			NIST
Phenylethanenitrile				Wikipedia	NIST
1-Phenylethanol		1	1		NIST
Phenylethanone		3	2	Wikipedia	NIST
Phenylethanone SeAr intermediate		1	1		NIST
Phenylethene		2	4	Wikipedia	NIST
cis-(2-Phenylethenyl)benzene		1		Wikipedia	NIST
trans-(2-Phenylethenyl)benzene			1	Wikipedia	NIST
(1R)-1-Phenylethyl ethanoate		1			NIST
(1S)-1-Phenylethyl ethanoate		1			NIST
(2-Phenylethyl)benzene		1			NIST
9-Phenylfluorene		1			NIST
9-Phenylfluorene anion			1	Wikipedia	NIST
(+/-) Phenylglycolic acid		1		Wikipedia	NIST
Phenylhydrazine			1	Wikipedia	NIST
Phenylmethane		6	16	Wikipedia	NIST
Phenylmethanol		5	1	Wikipedia	NIST
Phenylmethyl carbanion			2	Wikipedia	NIST
Phenylmethyl lithium					NIST
Phenylmethylium ion			4		NIST
Phenyloxonium ion		1			NIST
Phenylphosphine				Wikipedia	NIST
2-Phenylprop-2-ylium ion					NIST
3-Phenylpropan-1-ol		2			NIST
2-Phenylpropane		1	1	Wikipedia	NIST
3-Phenylpropenal			3	Wikipedia	NIST
Phenylselenide anion		1	2		NIST
Phenylsulfinate ion			2		NIST
Phenyltelluride anion			1		NIST
Phenyl tricyanoethene		1			NIST
PhEt		4	1	Wikipedia	NIST
PhF			2	Wikipedia	NIST
PhI		3		Wikipedia	NIST
PhLi		2	2		NIST
Phlogopite	KMg₃(AlSi₃O₁₀) (F,OH)₂			Wikipedia
PhMe		6	16	Wikipedia	NIST
[PhN2]+		2	11		NIST
PhN=NPh					NIST
PhNH2		8	8	Wikipedia	NIST
PhNHMe				Wikipedia	NIST
PhNMe2			2		NIST
PhNO			1	Wikipedia	NIST
PhNO2		3	6	Wikipedia	NIST
PhOH		8	10	Wikipedia	NIST
PhOMe			2	Wikipedia	NIST
PhOPh					NIST
Phosgene		2	6	Wikipedia	NIST
Phosphane	PH₃	6	2	Wikipedia	NIST
Phosphate di-substituted (generic)				Wikipedia
Phosphate dianion, hydrogen	[HPO₄]^2–	1	2		NIST
Phosphate ion	[PO₄]^3–	2	7	Wikipedia	NIST
Phosphate ion, dihydrogen	[H₂PO₄]^–	1	3		NIST
Phosphate minerals	Phosphate Rock		1	Wikipedia
Phosphate rock	Phosphate Rock		1	Wikipedia
Phosphate tri-substituted (generic)				Wikipedia
Phosphate, mono-substituted (generic)				Wikipedia
Phosphide ion	P^3–		10	Wikipedia	NIST
Phosphine	PH₃	6	2	Wikipedia	NIST
Phosphine (generic)	R₃P	1	1
Phosphine anion	[H₂P]^–		1		NIST
Phosphine anion (generic)	[R₂P]^–
Phosphine oxide (generic)	R₃P=O
Phosphine, dimethyl phenyl					NIST
Phosphine, diphenyl		1			NIST
Phosphine, diphenyl methyl					NIST
Phosphine, phenyl				Wikipedia	NIST
Phosphine, tri n-butyl		1		Wikipedia	NIST
Phosphine, tri t-butyl		1			NIST
Phosphine, tricyclohexyl				Wikipedia	NIST
Phosphine, triethyl	(CH₃CH₂)₃P	1	2		NIST
Phosphine, triphenyl		1	4	Wikipedia	NIST
Phosphine, trisubstituted (generic)	R₃P	1	1
Phosphinic acid (generic)				Wikipedia
Phosphinous acid (generic)
Phosphite ion	[HPO₃]^2–		1	Wikipedia	NIST
Phosphite ion, hydrogen	[H₃PO₄]^–	1	1		NIST
Phosphite, triethyl	(CH₃CH₂O)₃P		4	Wikipedia	NIST
Phosphite, trimethyl	(CH₃O)₃P			Wikipedia	NIST
Phosphole				Wikipedia	NIST
Phospholeum			1	Wikipedia	NIST
Phosphonate stabilised carbanion (generic)		1	1
Phosphonate, benzyl diethyl		1			NIST
Phosphonate, diethyl 1° alkyl (generic)		2	1
Phosphonate, diethyl alkyl (generic)		1
Phosphonic acid (generic)				Wikipedia
Phosphonium ion	[PH₄]⁺	1			NIST
Phosphonium ion (generic)	[R₃PH]⁺	1
Phosphonium ion, alkyl triphenyl (generic)	[(C₆H₅)₃P–CH₂R]⁺	2	1
Phosphonium ion, triethyl	[(CH₃CH₂)₃PH]⁺	1			NIST
Phosphonium ion, trimethyl	[(CH₃)₃PH]⁺	1			NIST
Phosphonous acid (generic)
Phosphor bronze 30	Phosphor Bronze 30			Wikipedia	NIST
Phosphoric acid	H₃PO₄	8	7	Wikipedia	NIST
Phosphoric acid, hypo			1		NIST
Phosphoric acid, poly			1	Wikipedia	NIST
Phosphoric acid, pyro		2		Wikipedia	NIST
Phosphorus 31	³¹P	1		Wikipedia	NIST
Phosphorus acid	H₃PO₃	8	1	Wikipedia	NIST
Phosphorus acid, hypo	H₃PO₂	2	2	Wikipedia	NIST
Phosphorus acid, pyro					NIST
Phosphorus hexafluoride ion	[PF₆]^–	1			NIST
Phosphorus hydride	PH₃	6	2	Wikipedia	NIST
Phosphorus oxychloride	POCl₃	6	4	Wikipedia	NIST
Phosphorus pentabromide	PBr₅	2		Wikipedia	NIST
Phosphorus pentachloride	PCl₅	1	9	Wikipedia	NIST
Phosphorus pentachloride g	PCl₅(g)			Wikipedia	NIST
Phosphorus pentafluoride	PF₅	3	1	Wikipedia	NIST
Phosphorus pentasulfide	P₂S₅	1		Wikipedia	NIST
Phosphorus pentoxide	P₂O₅	3	8	Wikipedia	NIST
Phosphorus sesquisulfide	P₂S₃		1	Wikipedia	NIST
Phosphorus sulfochloride	PSCl₃	1			NIST
Phosphorus thiochloride	PSCl₃	1			NIST
Phosphorus tribromide	PBr₃	2	2	Wikipedia	NIST
Phosphorus trichloride	PCl₃	2	19	Wikipedia	NIST
Phosphorus trifluoride	PF₃	2	1	Wikipedia	NIST
Phosphorus triiodide	PI₃		1	Wikipedia	NIST
Phosphorus trioxide	P₂O₃	1	2	Wikipedia	NIST
Phosphorus trisulfide	P₂S₃		1	Wikipedia	NIST
Phosphorus, red	P Red	1	1	Wikipedia	NIST
Phosphorus, white	P	3	20	Wikipedia	NIST
Photo activated species (generic)	R* ^{photoactivated}
Photon	hν		52	Wikipedia	NIST
Photon (high energy)	γ	82	2	Wikipedia	NIST
[PhO]-		2	7		NIST
PhPh		2		Wikipedia	NIST
PhPH2				Wikipedia	NIST
PhS-			5		NIST
PhSe+			1		NIST
PhSeBr		2			NIST
[PhSe]-		1	2		NIST
PhSH		1		Wikipedia	NIST
[PhSiH2]-			1		NIST
PhSO2Me		1			NIST
[PhSO2]-			2		NIST
[PhSO3]-			1		NIST
Phthalate (o) (hydrogen) ion		1	1		NIST
o-Phthalate dianion			1		NIST
o-Phthalic acid		2	1	Wikipedia	NIST
Phthalic anhydride		3	4	Wikipedia	NIST
Phthalimide		3		Wikipedia	NIST
Phthalimide ion			2	Wikipedia	NIST
Phthalimide, potassium salt		1		Wikipedia	NIST
π-HOMO Lewis base (generic)			6
pi-LUMO Lewis acid (generic)			4
PI3	PI₃		1	Wikipedia	NIST
3-Picoline		1	1		NIST
4-Picoline		2			NIST
2-Picoline, 5-ethyl		2	1		NIST
alpha-Picoline		3	1	Wikipedia	NIST
Picrate ion			1	Wikipedia	NIST
Picratol	52% Picric acid 48% TNT	1		Wikipedia
Picric acid		2	1	Wikipedia	NIST
Picrite		1		Wikipedia	NIST
Piemontite	Ca₂(Al,Fe,Mn)₃Si₃O₁₂(OH)			Wikipedia
Pimelic ketone		5	5	Wikipedia	NIST
Pinacolone		1	1	Wikipedia	NIST
Pion	π⁺	1		Wikipedia
2-Pipecoline		1			NIST
Piperidine			1	Wikipedia	NIST
Piperidine, protonated		1			NIST
Pitch	Pitch	1		Wikipedia	NIST
Pitchblende	UO₂			Wikipedia
Pivalic acid		1			NIST
Plagioclase	NaAlSi₃O₈– CaAl₂Si₂O₈			Wikipedia
Plaster of Paris	CaSO₄ .½H₂O	1	1	Wikipedia	NIST
Platinous chloride	PtCl₂			Wikipedia	NIST
Platinous potassium chloride	K₂[PtCl₄]	1	1		NIST
Platinum	Pt	1	9	Wikipedia	NIST
Platinum gold, white	White Platinum Gold				NIST
Platinum on carbon	Pt ^{on carbon}		10	Wikipedia	NIST
Platinum trioxide	PtO₃				NIST
Platinum zirconium alloy	ZrPt₃	1			NIST
Platinum(IV) hexafluoride	PtF₆	1	2	Wikipedia	NIST
Platinum-iridium alloy	Pt-Ir				NIST
Platinum(II) bromide	PtBr₂			Wikipedia	NIST
Platinum(II) chloride	PtCl₂			Wikipedia	NIST
Platinum(II) cis-diamminodichloro complex	Pt(NH₃)₂Cl₂			Wikipedia	NIST
Platinum(II) fluoride	PtF₂				NIST
Platinum(II) iodide	PtI₂				NIST
Platinum(II) ion	Pt²⁺		3		NIST
Platinum(II) oxide	PtO				NIST
Platinum(II) tetrachloride ion	[PtCl₄]^2–	1	1		NIST
Platinum(II,IV) oxide	Pt₃O₄				NIST
Platinum(III) chloride	PtCl₃				NIST
Platinum(III) iodide	PtI₃				NIST
Platinum(IV) bromide	PtBr₄				NIST
Platinum(IV) chloride	PtCl₄			Wikipedia	NIST
Platinum(IV) fluoride	PtF₄				NIST
Platinum(IV) hexachloride ion	[PtCl₆]^2–		1		NIST
Platinum(IV) iodide	PtI₄				NIST
Platinum(IV) oxide	PtO₂			Wikipedia	NIST
Platinum(V) fluoride	PtF₅	1			NIST
Platinum(VI) oxide	PtO₃				NIST
Plattnerite	PbO₂		4	Wikipedia	NIST
Plexiglass		1		Wikipedia	NIST
Plumber's solder	Plumber's Solder				NIST
Plumbic chloride	PbCl₄		1		NIST
Plumbic fluoride	PbF₄		1		NIST
Plumbous fluoride	PbF₂	1		Wikipedia	NIST
Plumbum		6		Wikipedia	NIST
Plutonium	Pu			Wikipedia	NIST
Plutonium 238	²³⁸Pu	1	1	Wikipedia	NIST
Plutonium 239	²³⁹Pu	1	1	Wikipedia	NIST
Plutonium 241	²⁴¹Pu		1	Wikipedia	NIST
Pm	Pm			Wikipedia	NIST
Pnictogens (generic)	Group Va/15 Pnictogens			Wikipedia
Po	Po			Wikipedia	NIST
[PO4]3-	[PO₄]^3–	2	7	Wikipedia	NIST
POCl3	POCl₃	6	4	Wikipedia	NIST
Polar-covalent bond (generic)
Polonium	Po			Wikipedia	NIST
Polonium 210	²¹⁰Po	1	1		NIST
Polonium 211	²¹¹Po	1	1	Wikipedia	NIST
Polonium 212	²¹²Po	1	1	Wikipedia	NIST
Polonium 213	²¹³Po	1	1	Wikipedia	NIST
Polonium 214	²¹⁴Po	1	1	Wikipedia	NIST
Polonium 215	²¹⁵Po	2	1	Wikipedia	NIST
Polonium 216	²¹⁶Po	1	2	Wikipedia	NIST
Polonium 218	²¹⁸Po	1	2	Wikipedia	NIST
Poly(chloroethene)		1		Wikipedia	NIST
Poly(dimethysiloxane)	[(CH₃)₂SiO]_n	1			NIST
Poly(phenylethene)		1		Wikipedia	NIST
Poly(propene)		1		Wikipedia	NIST
Polyacetal		1		Wikipedia	NIST
Polyacrylonitrile		1	1	Wikipedia	NIST
Polybutadiene		1		Wikipedia	NIST
Polybutadiene rubber	Polybutadiene Rubber	1		Wikipedia	NIST
Polycarbonate	Polycarbonate	1		Wikipedia	NIST
Polychloroprene		1		Wikipedia	NIST
Polycyclic aromatic (generic)		1	1	Wikipedia
Polydentate base (generic)				Wikipedia
Polyene (generic)			1
Polyethene	–[CH₂CH₂]_n–	2	1		NIST
Polyethylene	–[CH₂CH₂]_n–	2	1		NIST
Polyethylene glycol (generic)	Polyethylene Glycol	1		Wikipedia
Polyethylene terephthalate	Terylene	2		Wikipedia	NIST
Polyethylene-silane graft		1	1		NIST
Polyhalite	K₂Ca₂Mg(SO₄)₄ .2H₂O		1	Wikipedia
Polyhalogen ion (generic)	Polyhalogen Ion
cis-Polyisoprene		1		Wikipedia	NIST
trans-Polyisoprene		1		Wikipedia
Polymer (AS/A2 generic)				Wikipedia
Polymer (generic)	Polymer		1	Wikipedia
Polymethylmethacrylate		1		Wikipedia	NIST
Polynuclear aromatic hydrocarbon (generic)		1	1	Wikipedia
Polyoxymethylene		1		Wikipedia	NIST
Polyphosphoric acid			1	Wikipedia	NIST
Polypropylene		1		Wikipedia	NIST
Polystyrene		1		Wikipedia	NIST
Polytetrafluoroethylene		1		Wikipedia	NIST
Polythiazyl	(SN)_x	1		Wikipedia	NIST
Polyurethane	Polyurethane	1		Wikipedia	NIST
Polyvinyl alcohol		1		Wikipedia	NIST
Polyvinyl fluoride		1		Wikipedia	NIST
Polyvinylacetate		1	1	Wikipedia	NIST
Polyvinylchloride		1		Wikipedia	NIST
Polyvinylidene chloride		1		Wikipedia	NIST
Porphyrin			1	Wikipedia	NIST
Positron	β⁺	6	1	Wikipedia	NIST
Potassium	K	6	24	Wikipedia	NIST
Potassium acid carbonate	KHCO₃	2	1	Wikipedia	NIST
Potassium alum	KAl(SO₄)₂.12H₂O	1		Wikipedia	NIST
Potassium aluminium hydride	KAlH₄				NIST
Potassium amide	KNH₂	2			NIST
Potassium antimonide	K₃Sb	2	1		NIST
Potassium arsenide	K₃As	2	1		NIST
Potassium arsenite	KAsO₂			Wikipedia	NIST
Potassium bicarbonate	KHCO₃	2	1	Wikipedia	NIST
Potassium bifluoride	K[HF₂]	3	1		NIST
Potassium borohydride	KBH₄				NIST
Potassium bromate	NaBrO₃	1	1	Wikipedia	NIST
Potassium bromide	KBr	12		Wikipedia	NIST
Potassium buckide	K₃C₆₀	1		Wikipedia	NIST
Potassium tertiary butoxide		2	2		NIST
Potassium carbide	KCâ‰¡CK	2			NIST
Potassium carbonate	K₂CO₃	4	2	Wikipedia	NIST
Potassium chlorate	KClO₃	2	2	Wikipedia	NIST
Potassium chloride	KCl	11	11	Wikipedia	NIST
Potassium cyanide	KCN	1	5	Wikipedia	NIST
Potassium dichromate(VI)	K₂Cr₂O₇	1	5	Wikipedia	NIST
Potassium dioxide	K₂O	3	3	Wikipedia	NIST
Potassium fluoride	KF	5	5	Wikipedia	NIST
Potassium graphite	C₈K	1		Wikipedia	NIST
Potassium hexachloro platinate	K₂[PtCl₆]	1			NIST
Potassium hydride	KH	2	1	Wikipedia	NIST
Potassium hydrogen carbonate	KHCO₃	2	1	Wikipedia	NIST
Potassium hydrogen difluoride	K[HF₂]	3	1		NIST
Potassium hydrogen sulfide	KSH	3			NIST
Potassium hydroxide	KOH	12	18	Wikipedia	NIST
Potassium iodide	KI	2	6	Wikipedia	NIST
Potassium ion	K⁺	19	45		NIST
Potassium ion 18-crown-6 complex		2			NIST
Potassium magnesium chloride hexahydrate	KCl.MgCl₂.6H₂O	1			NIST
Potassium manganate(V)	K₃MnO₄	2	1		NIST
Potassium manganate(VI)	K₂MnO₄	2	1		NIST
Potassium manganate(VII)	KMnO₄	2	4	Wikipedia	NIST
Potassium metaarsenite	KAsO₂			Wikipedia	NIST
Potassium nitrate	KNO₃	3	1	Wikipedia	NIST
Potassium nitrosodisulfonate	(KSO₃)₂NO		1	Wikipedia	NIST
Potassium oxide	KO₂	2	2	Wikipedia	NIST
Potassium ozonide	KO₃	2			NIST
Potassium perbromate	NaBrO₄	2			NIST
Potassium perchlorate	KClO₄	3	1	Wikipedia	NIST
Potassium permanganate	KMnO₄	2	4	Wikipedia	NIST
Potassium peroxide	K₂O₂	2		Wikipedia	NIST
Potassium phosphide	K₃P	2			NIST
Potassium phthalimide		1		Wikipedia	NIST
Potassium rhenium nonahydride	K₂ReH₉	1		Wikipedia	NIST
Potassium selenide	K₂Se	2			NIST
Potassium sodium tartrate	KNa Tartrate .4H₂O		1	Wikipedia	NIST
Potassium stibnide	K₃Sb	2	1		NIST
Potassium sulfate	K₂SO₄	2	1	Wikipedia	NIST
Potassium sulfide	K₂S	3	1	Wikipedia	NIST
Potassium sulphate	K₂SO₄	2	1	Wikipedia	NIST
Potassium superoxide	K₂O	3	3	Wikipedia	NIST
Potassium telluride	K₂Te	2			NIST
Potassium tetrachloroplaninate(II)	K₂[PtCl₄]	1	1		NIST
Potassium tetrahydrozinc(II) complex	K₂ZnH₄	1			NIST
Potassium trichloro(ethylene)platinate(II) hydrate		1		Wikipedia	NIST
Potassium trisalicaldehyde complex		1			NIST
Pr	Pr			Wikipedia	NIST
Pr2O3	Pr₂O₃				NIST
Praseodymia	Pr₂O₃				NIST
Praseodymium	Pr			Wikipedia	NIST
Praseodymium(III) bromide	PrBr₃				NIST
Praseodymium(III) chloride	PrCl₃			Wikipedia	NIST
Praseodymium(III) iodide	PrI₃				NIST
Praseodymium(III) oxide	Pr₂O₃				NIST
Praseodymium(IV) oxide	PrO₂				NIST
PrBr		3		Wikipedia	NIST
PrBr3	PrBr₃				NIST
PrCl3	PrCl₃			Wikipedia	NIST
Precipitated silica	Si(OH)₄	2		Wikipedia	NIST
Prehnite	Ca₂Al(AlSi₃ O₁₀)(OH)₂			Wikipedia
PrI3	PrI₃				NIST
Primary alcohol (AS/A2 generic)		4	1	Wikipedia
Primary alcohol (generic)	RCH₂OH	15	3
Primary alkyl amine (generic)	R–NH₂	4	9
Primary amine (AS/A2 generic)		2		Wikipedia
PrNH2			1	Wikipedia	NIST
Pro		1	1	Wikipedia	NIST
PrO2	PrO₂				NIST
Producer gas	CO + 2N₂ ^{producer gas}	1		Wikipedia	NIST
Proline		1	1	Wikipedia	NIST
Proline, deprotonated			1	Wikipedia	NIST
Proline, protonated		1		Wikipedia	NIST
Promethium	Pm			Wikipedia	NIST
Prop-1-ene-3-ide anion			2	Wikipedia	NIST
Prop-1-ene-3-ylium ion			2		NIST
Prop-1-yn-3-ylium ion	[HC≡C–CH₂]⁺		1		NIST
Prop-2-en-1-imine					NIST
Prop-2-ylium ion		3	7		NIST
1,2-Propadiene	H₂C=C=CH₂			Wikipedia	NIST
Propan-1-ide anion			2		NIST
Propan-1-ol		4	2	Wikipedia	NIST
Propan-2-ide anion			3	Wikipedia	NIST
Propan-2-ol		9	8	Wikipedia	NIST
Propanal		3	3	Wikipedia	NIST
Propane		2	2	Wikipedia	NIST
Propane-1,2,3-triol		10	2	Wikipedia	NIST
Propanedinitrile	(CN)₂CH₂	1		Wikipedia	NIST
Propanedinitrile anion	[(CN)₂CH]^–		1	Wikipedia	NIST
Propanedioic acid		2	2	Wikipedia	NIST
Propanedioic acid diester (generic)		1
Propanenitrile	CH₃CH₂CN		1	Wikipedia	NIST
Propanoate ion			1		NIST
Propanoic acid	CH₃CH₂COOH	5	1	Wikipedia	NIST
Propanoic acid, ethyl ester		1			NIST
1-Propanol		4	2	Wikipedia	NIST
2-Propanol		9	8	Wikipedia	NIST
Propanone		15	19	Wikipedia	NIST
Propanoyl chloride			1		NIST
Propargyl alcohol	HC≡CCH₂OH	3		Wikipedia	NIST
Propargyl alcohol (generic)			2	Wikipedia
Propargyl alkoxide ion			1		NIST
Propargylic cation	[HC≡C–CH₂]⁺		1		NIST
Propargylic cation (generic)			1
Propargylic cation synthon (generic)		1
Propargylic-Nfg complex (generic)		1
2-Propen-1-ol		8	2	Wikipedia	NIST
Propenal		3	4	Wikipedia	NIST
Propene	CH₃–CH=CH₂	13	29	Wikipedia	NIST
Propenenitrile		6	10	Wikipedia	NIST
1,2,3-Propenetricarboxylic acid		1	1	Wikipedia	NIST
Propeneyl radical					NIST
Propenoic acid		6		Wikipedia	NIST
(2-Propenoxy)benzene			1		NIST
Propenyl anion			2	Wikipedia	NIST
Propenyl cation			2		NIST
2-(2-Propenyl)phenol		1			NIST
Propinioc acid	CH₃CH₂COOH	5	1	Wikipedia	NIST
beta-Propiolactone		1	6	Wikipedia	NIST
Propionaldehyde		3	3	Wikipedia	NIST
Propionyl chloride			1		NIST
2-Propyl alkoxide ion	[(CH₃)₂CH–O]^–	2	1		NIST
2° Propyl anion			3	Wikipedia	NIST
1-Propyl anion			2		NIST
1-Propyl bromide		3		Wikipedia	NIST
2-Propyl bromide	(CH₃)₂CHBr	4	8		NIST
N-Propyl bromide		3		Wikipedia	NIST
Propyl carbenium ion			3		NIST
Propyl carbocation, secondary		3	7		NIST
Propyl cation, primary		1	1	Wikipedia	NIST
Propyl propanoate		1			NIST
1-Propyl radical		2			NIST
iso-Propyl function (generic)
n-Propyl function (generic)				Wikipedia
n-Propylamine			1	Wikipedia	NIST
1-Propylamine			1	Wikipedia	NIST
iso-Propylamine	(CH₃)₂CHNH₂	1		Wikipedia	NIST
1-Propyl ammonium ion		1			NIST
Propylene	CH₃–CH=CH₂	13	29	Wikipedia	NIST
Propylene chlorohydrin		1	1		NIST
Propylene oxide		3	1	Wikipedia	NIST
2-Propyliodide	(CH₃)₂CHI	3			NIST
2-Propyn-1-ol	HC≡CCH₂OH	3		Wikipedia	NIST
Propyne	CH₃–C≡C–H		1	Wikipedia	NIST
Prostaglandin E1	PGE₁			Wikipedia	NIST
Prostaglandin E2				Wikipedia	NIST
Prostaglandin F2 alpha	PGE_2α			Wikipedia	NIST
Protactinium	Pa				NIST
Protactinium 231	²³¹Pa	1	1	Wikipedia	NIST
Protactinium 233	²³³Pa	1	1	Wikipedia	NIST
Protactinium 234	²³⁴Pa	1	1	Wikipedia	NIST
Protein (generic)	Protein			Wikipedia
Protein, single cell	SCP	2		Wikipedia
Proton	H⁺	77	547	Wikipedia	NIST
Proton (nuclear chemistry)	¹H	3	7	Wikipedia
Proton abstractor, charged (generic)	Base^– ^{Proton abstractor}		16	Wikipedia
Proton abstractor, neutral (generic)	Base: ^{Proton abstractor}		4	Wikipedia
Proton Lewis acid (generic)			4	Wikipedia
Proton sponge Lewis base (generic)				Wikipedia
Proton, anti	_— p	1		Wikipedia
Protonated base, H-B (generic)	Base-H ^{Protonated base}	8
Protonated base, [H-B]+ (generic)		2
Protonated ethanol		1	2		NIST
Protonated formaldehyde		1			NIST
Protonated helium	[HHe]⁺	1			NIST
Protonated molecular hydrogen	[H₃]⁺	2	3	Wikipedia	NIST
Protonated nucleofuge, H-Nfg (generic)		1
Protonated nucleophile, H-Nu (generic)		1
Protonated nucleophile, [H-Nfg]+ (generic)		2
Protonated nucleophile, [H-Nu]+ (generic)		1
Protonated xenon	[XeH]⁺				NIST
Proustite	Ag₃AsS₃			Wikipedia
Prussiate of Soda	NaCN	2	4	Wikipedia	NIST
PSCl3	PSCl₃	1			NIST
Pseudohalogen (generic)	Pseudohalogen			Wikipedia
D-Psicose				Wikipedia	NIST
Psilocybin				Wikipedia	NIST
Psilocybine				Wikipedia	NIST
Psilomelane	Mn_xO_y _{mixture of oxides}			Wikipedia
Psychotomimetic (generic)	Hallucinogen			Wikipedia
Pt on C	Pt ^{on carbon}		10	Wikipedia	NIST
Pt	Pt	1	9	Wikipedia	NIST
Pt(NH3)2Cl2	Pt(NH₃)₂Cl₂			Wikipedia	NIST
Pt2+	Pt²⁺		3		NIST
Pt3O4	Pt₃O₄				NIST
PtBr2	PtBr₂			Wikipedia	NIST
PtBr4	PtBr₄				NIST
PtCl2	PtCl₂			Wikipedia	NIST
PtCl3	PtCl₃				NIST
PtCl4	PtCl₄			Wikipedia	NIST
[PtCl4]2-	[PtCl₄]^2–	1	1		NIST
[PtCl6]2-	[PtCl₆]^2–		1		NIST
PtF2	PtF₂				NIST
PtF4	PtF₄				NIST
PtF5	PtF₅	1			NIST
PtF6	PtF₆	1	2	Wikipedia	NIST
[PtF6]-	[PtF₆]^–	1	1		NIST
PTFE		1		Wikipedia	NIST
PtI2	PtI₂				NIST
PtI3	PtI₃				NIST
PtI4	PtI₄				NIST
PtO	PtO				NIST
PtO2	PtO₂			Wikipedia	NIST
PtO3	PtO₃				NIST
Pu	Pu			Wikipedia	NIST
Pulmbous pulmbate	Pb₂O₃				NIST
Purine				Wikipedia	NIST
Purple gold	Purple Gold				NIST
Putrescine		2		Wikipedia	NIST
PVC		1		Wikipedia	NIST
PVF		1		Wikipedia	NIST
Pyrargyrite	Ag₃SbS₃			Wikipedia
Pyrazine				Wikipedia	NIST
Pyrazole				Wikipedia	NIST
2-Pyrazoline		1			NIST
Pyrene				Wikipedia	NIST
Pyrex® glass	Pyrex®	1		Wikipedia
Pyridazine				Wikipedia	NIST
Pyridine		2	4	Wikipedia	NIST
Pyridine (generic)				Wikipedia
Pyridine hydrochloride		2			NIST
Pyridine, 2-methyl		3	1	Wikipedia	NIST
Pyridine, 5-ethyl-2-methyl		2	1		NIST
Pyridine, protonated		1	1		NIST
Pyridine-3-carboxylic acid		4		Wikipedia	NIST
3-Pyridinecarboxylic acid amide		1	1	Wikipedia	NIST
Pyridinium chlorochromate			2	Wikipedia	NIST
Pyridinium hydrochloride		2			NIST
Pyridinium ion		1	1		NIST
Pyridinium ion, 2-methyl		1			NIST
Pyridinium ion, 4-methyl-2,6-di tertiary butyl		1			NIST
Pyridinium ion, 2,4,6-trimethyl		1			NIST
Pyrimidine				Wikipedia	NIST
2,4,(1H,3H)-Pyrimidinedione	Uracil U			Wikipedia	NIST
Pyrimidinetrione			1	Wikipedia	NIST
Pyrite	FeS₂ ^pyrite		2	Wikipedia
Pyrochlore	(Ca,Na)₂Nb₂O₆ (O,OH,F)			Wikipedia
Pyrolusite	MnO₂		1	Wikipedia
Pyromorphite	Pb₅(PO₄)₃Cl			Wikipedia
Pyrophosphoric acid		2		Wikipedia	NIST
Pyrophosphorus acid					NIST
Pyrosulfite ion			2		NIST
Pyrosulfuric acid	H₂S₂O₇	1	6	Wikipedia	NIST
Pyrosulfurous acid		1			NIST
Pyroxylin	Nitrocellulose	1	1	Wikipedia	NIST
Pyrrhotite	Fe_0.8S		1	Wikipedia
Pyrrole				Wikipedia	NIST
Pyrrolidine			1	Wikipedia	NIST
Pyrrolidine, protonated		1			NIST
2,5-Pyrrolidinedione		2		Wikipedia	NIST
2-Pyrrolidinone		1		Wikipedia	NIST
Pyruvate ion			1		NIST
Pyruvic acid		1		Wikipedia	NIST
Pyrylium ion			1		NIST
Pyrylium tetrafluoroborate		1			NIST

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