Element X forms a chloride with the formula XCl2 which is a solid with a high melting point. X would most likely be in the same group of the periodic table as :


Mg has the valency 2. So, when it combine with chlorine having valency 1, it forms Mgcl2. Whereas Na has valency 1, Al has valency 3 and Si has valency 4.

2
1