Atoms are the smallest and basic unit of all the states of matter. The atoms combine to form a molecule. The two or molecules when combine to form a substance are then termed as a compound.
The carbon monoxide is not an atom because:
1. Carbon monoxide is the simplest molecule of the oxocarbon family.
2. The molecule is made up of one atom of carbon and one atom of oxygen.
3. When two or more atoms combine it forms a molecule, thus, carbon monoxide is a molecule.
Thus, carbon monoxide is made up of two different atoms, referred to as molecules.
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