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Oxygen atoms have 6valence electrons.Oxygen has six valence electrons, two in the 2s subshell and 4 in the 2p subshell.Oxygen (O) isa nonmetallic chemical element that Group 16 (VIa, or the oxygen group) the the periodic table.Oxygen is a colourless, odourless, tasteless gas important to living organisms, gift taken increase by animals, which transform it to carbon dioxideplants, in turn, utilize carbon dioxide together a source the carbon and return the oxygen come the atmosphere.

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Oxygen was discovered about 1772 by a Swedish chemist, Carl Wilhelm Scheele, who obtained it by heating potassium nitrate, mercuric oxide, and also many other substances.At 46 per centof the mass, oxygen is the most plentiful element in Earth’s crust.The proportion of oxygen by volume in the atmosphere is 21 per centand by weight in seawater is 89 per cent.