Q.
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 -
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Classification of Elements and Periodicity in Properties
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Solution:
Elements of group Na form XCl halide.
Elements of group Mg form XCl2 halide.
Elements of group Al form XCl3 halide.
Elements of group Si form XCl4 halide.
As an element, X forms a chloride with the formula XCl2, which is solid with a high melting point. X would most likely be in the same group of Mg.