Question

When the similar atoms combine, they form a molecule of a/an ___.

Answer 1

• Those molecules which are made up of same kind of atoms are known as molecules of an element. For example, ${\mathrm{H}}_2$(hydrogen gas)
• While those molecules which are formed by a different types of atoms are known as molecules of compounds. For example, ${\mathrm{H}}_2\mathrm{O}$ (water).

Thus, when the similar atoms combine, they form a molecule of a/an element.