Which molecules are compounds?

Answer 1

Molecules are the combination of two or more atoms which may exist free in gaseous form or in solutions, the ionic compounds are not the molecular compounds because their one unit can not exists freely but as the crystal lattice.

Answer 2

All but H2, O2, F2, Br2, I2, Cl2, and N2. Those are diatomic elements, and when they are bonded together they are just referred to as the name of the element. (O2 is just called Oxygen instead of Dioxygen for example)

Answer 3

Same type of molecules taken together is called a compound

Same type of molecules taken together is called a compound