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?


because Mg has the valency 2, and valency in a group remains the same...Also, when it combines with Clorine (having valency 1)..it forms MgCl2

Na has valency 1

Al has valency 3

Si has valency 4

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