Which of the following has zerooxidation number fro every atom ?

1.	Which of the following has zerooxidation number fro every atom ?
Answer» Polyatomic ion Polytomic MOLECULE Polyatomic element None of these Solution :Polyatomic ELEMENTS such as `H_2, O_2, O_3, P_(4)`, and ` S_8` have two or more identicla atoms per molecule . In FREE elements (that is, in the uncombined state), each ATOM has an oxidation number of zero as bonded atoms have zero electronegativity difference.

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