Question

drag the missing word into place
an atom of carbon will with an atom of oxygen to
form the molecule carbon monoxide.
bond
neutron
matter

Explanation:

To form a molecule (like carbon monoxide), atoms interact by forming a chemical connection. "Bond" means to form a chemical bond, while "neutron" is a subatomic particle and "matter" is a general term for substance. So "bond" fits the context of carbon and oxygen forming a molecule.

Answer:

bond