Question

Give one example each of a molecule of an element and molecule of a compound.

Answer 1

• In a molecule of oxygen gas (${\mathrm{O}}_2$) there are two oxygen atoms ($\mathrm{O}$). Hence it's a molecule of an element.
• In a molecule of Sodium chloride $\left(\mathrm{NaCl}\right)$ there is one sodium ($\mathrm{Na}$) atom and one chlorine ($\mathrm{Cl}$) atom. Hence it's a molecule of a compound.