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Which of the following is an element? O3 HCl HCl CO
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Which of the following is an element?
O3
HCl
HCl
CO

User Radpotato
by
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1 Answer

3 votes

Answer: CO

Explanation: The other three are considered compounds. CO is Cobalt, which has an atomic number of 27.

User Lordchancellor
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