A chemical compound containing seven oxygen atoms bonded to another element, often a metal or nonmetal.
From 'hept-' (seven) plus 'oxide', the compound formed when oxygen bonds with other elements. Used in chemistry since the 1800s.
Every time you see a chemical name with a number prefix plus 'oxide,' that number tells you exactly how many oxygen atoms are in the molecule—it's chemistry's way of drawing a quick map of the atomic neighborhood.
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