1.

The valency of magnesium is​

Answer»

2 +

Magnesium has valency equal to 2 + because the electronic configuration of Mg is [2,8,2]. The nearest NOBLE gas to magnesium is neon with electronic configuration of [2,8], to achieve this stable electronic configuration Mg can LOSE 2 valence electrons, HENCE its valency is 2 + .



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