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Question:

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: Na Mg Al Si

Mg

Si

Na

Al

Solution:

The correct option is B Mg
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 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.