Question

Element X forms a chloride with the formula XCl 2 , which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as (a) Na (b) Mg (c) Al (d) Si the answer is Mg . Why?

Answer 1

From the formula XCl2 we see that one atom of X combines with 2 atoms of Cl this means X has a valency of 2 just like Magnesium. (Remember the formula of magnesium chloride is MgCl2).
Na has valency 1 (NaCl)
Al has valency 3 (AlCl3)
Si has valency 4 (SiCl4)

Answer 2

X would most likely be in group Mg because it forms with group $XCl_{2}$

Explanation:

As we know that,

The elements belonging to group Na form XCl halide.  

The elements belonging to group Mg form XC$l_{2}$.  halide.  

The elements belonging to group Al form $XCl_{3}$ halide.  

The elements belonging to group Si form $XCl_{4}$  halide.

As an element, X forms a chloride with the formula group $XCl_{2}$  that is solid having a high melting point. Thus, X would most likely be in the group Mg.

Learn more: Periodic Table

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