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What is the valency of magnesium with at...

What is the valency of magnesium with atomic number 12 and sulphur with atomic number 16? 

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Electronic configurations are:
Magnesium `(12) to 2,8, 2,` Sulphur `(16) to 2,8,6`
For Magnesium, valency is same as number of valence electrons = 2 (since it has less than 4 valence electrons). The valency of Sulphur is 8-6= 2 (since it has more than 4 valence electrons).
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  1. What is the valency of magnesium with atomic number 12 and sulphur wit...

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