More on perchlorate from Fact Monster:

• chlorate - chlorate chlorate and perchlorate, salts of chloric acid, HClO3, and perchloric acid, HClO4, ...
• chlorate: Perchloric Acid and Its Salts - Perchloric Acid and Its Salts Perchloric acid, HClO4, is a volatile, unstable, colorless liquid ...
• radical, in chemistry - radical radical, in chemistry, group of atoms that are joined together in some particular spatial ...
• chlorate: Chloric Acid and Its Salts - Chloric Acid and Its Salts Chloric acid, HClO3·7H2O, is a colorless substance that occurs ...
• berkelium - berkelium berkelium [from Berkeley], artificially produced radioactive chemical element; symbol Bk; ...

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