Question

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

Answer 1

the answer is c. Co stands for the element cobalt 

Answer 2

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 :)