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 (a) Na (b) Mg (c) AI (d) Si

Answer: (b) Mg

We can see from the formula XCl2 that one atom of X combines with two atoms of Cl. It implies that X has a valency of two.

  • Na has 1 valency, so it forms NaCl
  • Mg has 2 valency electrons, so it forms MgCl2
  • Al has 3 valencies, as a result it forms AlCl3
  • Si has 4 valencies, so it forms SiCl4

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