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
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magnesium reacts with chlorine forms mgcl2
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We see that X combine with Cl2 t form XCl2 that is one atom of X is combining with two atoms of chlorine indicating that X has a valency of 2 which is similar to the valency of Magnesium or Mg and the compound formed is MgCl2.
Sodium has a valency of 1, and with chlorine, it forms NaCl, Aluminum has a valency of 3 and it forms AlCl3 and Silicon has a valency of 4 forming SiCl4 after reacting with chlorine.
Therefore the solid with a high melting point is Magnesium (Mg).
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