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Octane — octave — Odd Hassel — ohm — Olivine — Opal — Optical isomerism — Orbitals — Organic chemistry — organic compound — Organic nomenclature — Organic reaction — Orthoclase — Osmium — Osmium tetroxide — Otto Hahn — Otto Paul Hermann Diels — Otto Wallach — Oxidation — Oxidation number — oxidation state — oxide — oxygen —