1.

Element X forms a chloride with formula XCI_2, which is a solid with a high melting point. X would most likely be in the same group of the Periodic Table as

Answer»

`NA`
`MG`
`AI`
`Si`

SOLUTION :`XCI_2` indicates that it has a valency EQUAL to 2. Magnesium and other elements in this group have the valency equal to 2.


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