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Periodic Table for chemical entities containing the selected element
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Entity Names Starting With The Letter O	Structure	Reactions Forming	Reactions Using	Wikipedia	NIST
O	O	6	14		NIST
[O]	[O]		14		NIST
O(CH2)2O		2	1	Wikipedia	NIST
O2	O₂	60	163	Wikipedia	NIST
O2 (singlet, 1st excited state)	^1ΔO₂	2	1	Wikipedia	NIST
O2 (singlet, 2nd excited state)	¹Σ⁺_gO₂			Wikipedia	NIST
O2F2	O₂F₂	1		Wikipedia	NIST
[O2]+	[O–O]⁺	1			NIST
[O2]-	[O–O]^–		5	Wikipedia	NIST
[O2]2-	^–O–O^–		6	Wikipedia	NIST
O3	O₃	1	11	Wikipedia	NIST
[O3]-	[O₃]^–		1	Wikipedia	NIST
(OCH2O)n		1		Wikipedia	NIST
OCNH	HNCO	1			NIST
Octacarbonyldicobalt(0)	Co₂(CO)₈	1	1		NIST
(9Z, 12Z)-Octadecadienoic acid	Linoleic Acid	4		Wikipedia	NIST
Octadecanoic acid	CH₃(CH₂)₁₆COOH	1			NIST
(9Z, 12Z, 15Z)-Octadecatrienoic acid	Linolenic Acid	1		Wikipedia	NIST
(9Z)-Octadecenoic acid	Oleic Acid	6		Wikipedia	NIST
Octahedral molecular shape (generic)				Wikipedia
Octahedral, distorted molecular shape (generic)				Wikipedia
Octahedrite	TiO₂		1	Wikipedia
1,2,3,4,5,6,7,8-Octahydronaphthalene		1			NIST
9,10-Octalin		1			NIST
1,9-beta-Octalone			4		NIST
Octane		1	3	Wikipedia	NIST
1,3,5,7-Octatetrene					NIST
(2E, 4Z, 6E)-Octatriene			2		NIST
(2E, 4Z, 6Z)-Octatriene			2		NIST
Octogen			1	Wikipedia	NIST
Octol	75% HMX 25% TNT	1		Wikipedia
2-Octyl radical		1	1		NIST
OF2	OF₂	1		Wikipedia	NIST
Og	Og			Wikipedia	NIST
Oganesson	Og			Wikipedia	NIST
OH-/H2O	OH^–(aq)		8
OH.	HO•	12	8	Wikipedia	NIST
[OH3]+	[H₃O]⁺	5	5		NIST
[OH]+	[HO]⁺		1		NIST
[OH]-	[OH]^–	25	79	Wikipedia	NIST
Oil of aniseed				Wikipedia	NIST
Oil of cloves		1			NIST
Oil of nutmeg					NIST
Oil of peppermint component				Wikipedia	NIST
Oil of sassafras				Wikipedia	NIST
Oil of thyme and mint				Wikipedia	NIST
Oil of vanilla bean				Wikipedia	NIST
Oil of vitriol	H₂SO₄	25	74	Wikipedia	NIST
Oil, coconut	Coconut Oil		2	Wikipedia
Oil, corn	Corn Oil		1	Wikipedia
Oil, crude	Crude Oil		13	Wikipedia
Oil, linseed	Linseed Oil		1	Wikipedia
Oil, olive	Olive Oil		1	Wikipedia
Oil, peanut	Peanut Oil		2	Wikipedia
Oil, sunflower	Sunflower Oil		2	Wikipedia	NIST
Old Nick (Satan)	Ni	3	17	Wikipedia	NIST
Old Nick's (Satan's) copper	NiAs		1	Wikipedia
Oleic acid	Oleic Acid	6		Wikipedia	NIST
Oleum	H₂S₂O₇	1	6	Wikipedia	NIST
Olive oil	Olive Oil		1	Wikipedia
Olivenite	Cu₂AsO₄(OH)			Wikipedia
Olivine	(Mg,Fe)₂SiO₄			Wikipedia
Omega	Ω^–	1		Wikipedia
[ONC]-	[O=N=C]^–		2	Wikipedia	NIST
Onium ion Lewis acid (generic)			4	Wikipedia
Opal	SiO₂.nH₂O			Wikipedia
Opiate (generic)	Narcotic Analgesic			Wikipedia
pi-Organometallic (generic)				Wikipedia
Orlon		1	1	Wikipedia	NIST
Orpiment	As₂S₃			Wikipedia
Orthite	(Ca,Ce,Y,La,Th)₂ (Al,Fe)₃Si₃O₁₂(OH)			Wikipedia
Orthoborate ion	[BO₃]^3–			Wikipedia	NIST
Orthoboric acid	H₃BO₃	10	9	Wikipedia	NIST
Orthoclase	KAlSi₃O₈			Wikipedia
orthoHydrogen	↑H–H↑	1		Wikipedia	NIST
Tetrahydroorthoperiodate ion	[H₄IO₆]^–	1	1		NIST
Orthoperiodate (trihydrogen) ion	[H₃IO₆]^2–		1		NIST
Orthoperiodic acid	H₅IO₆	3	1	Wikipedia	NIST
Orthophosphoric acid	H₃PO₄	8	7	Wikipedia	NIST
Orthophosphorus acid	H₃PO₃	8	1	Wikipedia	NIST
Orthosilicate ion	[SiO₄]^4–		2	Wikipedia	NIST
Os	Os			Wikipedia	NIST
Os3+	Os³⁺				NIST
Os4+	Os⁴⁺				NIST
OsBr4	OsBr₄				NIST
OsCl3	OsCl₃				NIST
OsCl4	OsCl₄				NIST
OsCl5	OsCl₅				NIST
OsF4	OsF₄				NIST
OsF5	OsF₅				NIST
OsF6	OsF₆				NIST
OsF8	OsF₈				NIST
OsI4	OsI₄				NIST
Osmic acid	OsO₄			Wikipedia	NIST
Osmium	Os			Wikipedia	NIST
Osmium tetroxide	OsO₄			Wikipedia	NIST
Osmium(III) chloride	OsCl₃				NIST
Osmium(III) Ion	Os³⁺				NIST
Osmium(IV) bromide	OsBr₄				NIST
Osmium(IV) chloride	OsCl₄				NIST
Osmium(IV) fluoride	OsF₄				NIST
Osmium(IV) iodide	OsI₄				NIST
Osmium(IV) Ion	Os⁴⁺				NIST
Osmium(IV) oxide	OsO₂				NIST
Osmium(V) chloride	OsCl₅				NIST
Osmium(V) fluoride	OsF₅				NIST
Osmium(VI) fluoride	OsF₆				NIST
Osmium(VIII) fluoride	OsF₈				NIST
Osmium(VIII) oxide	OsO₄			Wikipedia	NIST
OsO2	OsO₂				NIST
OsO4	OsO₄			Wikipedia	NIST
ox- (ligand)	[C₂O₄]^2–	1	13	Wikipedia	NIST
7-Oxabicyclo [2.2.1] hepta-5-ene- 2,3-dicarboxylic anhydride		1			NIST
Oxalaldehyde		1	1	Wikipedia	NIST
Oxalate dianion	[C₂O₄]^2–	1	13	Wikipedia	NIST
Oxalate monoanion		1	1		NIST
Oxalate, sodium		2	1	Wikipedia	NIST
Oxalic acid		5	2	Wikipedia	NIST
Oxalic acid diamide		1		Wikipedia	NIST
Oxalic acid dinitrile	N≡C–C≡N	1	1	Wikipedia	NIST
Oxaloacetic acid		1	1	Wikipedia	NIST
Oxalosuccinic acid		1	1	Wikipedia	NIST
Oxalyl chloride				Wikipedia	NIST
Oxamide		1		Wikipedia	NIST
Oxammonium hydrochloride		1		Wikipedia	NIST
1-Oxaspiro[2.5]octane		1			NIST
Oxazole				Wikipedia	NIST
1,2-Oxazole				Wikipedia	NIST
Oxene	O	6	14		NIST
Oxenium ion	[HO]⁺		1		NIST
Oxenium ion (generic)	[R–O]⁺
2-Oxepanone		1		Wikipedia	NIST
Oxidane	H₂O	529	531	Wikipedia	NIST
Oxide ion	O^2–	1	27		NIST
Oxide, organic (generic)		3	5
Oxidised heavy metal oxidising agent (generic)
Oxidised main group element oxidising agent (generic)
Oxidising agent (AS/A2 generic)				Wikipedia
Oxime (generic)		1		Wikipedia
Oxirane		2	13	Wikipedia	NIST
Oxirane (generic)		3	5
Oxirane, O-alkylated (generic)			2
Oxo gas	CO + H₂ ^{Oxo Gas}		2		NIST
2-Oxo-10-boranesulfonic acid		1	1		NIST
2-Oxobutanedioic acid		1	1	Wikipedia	NIST
5-Oxohexanenitrile		1	1		NIST
1,3-Oxolane		1			NIST
Oxonium ion	[H₃O]⁺	5	5		NIST
Oxonium ion, dialkyl (generic)	[R₂OH]⁺	1	1
Oxonium ion, diethyl		1			NIST
Oxonium ion, dimethyl		1			NIST
Oxonium ion, dimethylamino hydroxy		1			NIST
Oxonium ion, ethyl		1	2		NIST
Oxonium ion, hydrated		1		Wikipedia	NIST
Oxonium ion, isopropyl		2			NIST
Oxonium ion, methyl		1			NIST
Oxonium ion, mono 1° alkyl (generic)	[RCH₂OH₂]⁺	1
Oxonium ion, monoalkyl (generic)
Oxonium ion, nitro		2	1		NIST
Oxonium ion, phenyl		1			NIST
Oxonium ion, protonated 1,4-dioxane		1			NIST
Oxonium ion, protonated THF		1			NIST
Oxonium ion, tertiary butyl		2			NIST
Oxonium ion, trialkyl (generic)	[R₃O]⁺		1
Oxonium ion, triethyl	[(CH₃CH₂)₃O]⁺				NIST
Oxonium ion, trihydrated		1		Wikipedia	NIST
Oxonium ion, trimethyl	[(CH₃)₃O]⁺				NIST
Oxonium ion, triphenyl					NIST
Oxonium ion/18-Crown-6 Complex		2			NIST
Oxonium, triethyl tetrafluoroborate	[Et₃O]⁺[BF₄]^–		1	Wikipedia	NIST
2-Oxopentanedioic acid		1	1	Wikipedia	NIST
Oxygen	O₂	60	163	Wikipedia	NIST
Oxygen 16	¹⁶O	2	6	Wikipedia	NIST
Oxygen delivered equivalents	[O]		14		NIST
Oxygen difluoride	OF₂	1		Wikipedia	NIST
Oxygen family (generic)	Group VIa/16 Chalcogens			Wikipedia
Oxygen hydride	H₂O	529	531	Wikipedia	NIST
Oxygen ion	O^2–	1	27		NIST
Oxygen, 1st excited singlet state	^1ΔO₂	2	1	Wikipedia	NIST
Oxygen, 2nd excited singlet state	¹Σ⁺_gO₂			Wikipedia	NIST
Oxyl radical	HO•	12	8	Wikipedia	NIST
Ozone	O₃	1	11	Wikipedia	NIST
Ozonide ion	[O₃]^–		1	Wikipedia	NIST
[O]2-	O^2–	1	27		NIST

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please contact Mark R. Leach, the author, using mark@meta-synthesis.com