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keemiliste elementide perioodilisussüsteemi VI rühma element, sümbol O (oxygenium), colourless odourless gaseous element belonging to group 16 (formerly VIB) of the periodic table; a.n. 8; r.a.m. 15.9994; d. 1.429 g dm−3; m.p. –218.4°C; b.p. –183°C