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氧（英語：oxygen）是一種化學元素，化學符號为O，原子序數为8，在元素週期表中屬於氧族元素（16族或VI族）。作为一种非金屬，氧是具有高反應性的氧化劑，能夠與大部分元素结合形成化合物（氧化物）。...