Magnesium (Mg).
Reason — Since, element M forms a chloride with the formula MCl2 which is a solid with high melting point. So, M belongs to the group 2 because it has valency 2.
Magnesium (Mg).
Reason — Since, element M forms a chloride with the formula MCl2 which is a solid with high melting point. So, M belongs to the group 2 because it has valency 2.