When ionic or covalent bonds are formed, chemical compounds are created . which of the following does not represent a compound ?
a.) na atoms

b.) no

c.) co

d.) cao

The best answer to this question is A because Na atoms are just by themselves and not combined with any other element. A compound is a chemical combination of 2 or more elements. All of the other examples have more than one element bonded together. So, the best answer is A. I hope that this helps :)

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The answer is ozone layer.