Question

State the valencies of the following elements : magnesium and sodium.​

Answer 1

Magnesium has the valency +2.

Because magnesium need 6 electrons to attain octet rule. But it is easy to lose 2 electrons than to gain 6 electrons.

Because gaining of electrons need more energy.

Sodium has the valency+1.

Because sodium need 7 electrons to attain octet rule. But it is easy to lose to electrons than to gain 7 electrons.

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Answer 2

Magnesium(Z=12) - 2,8,2

Valency of Magnesium is = 2

Sodium(Z=11) - 2,8,1

Valency of Sodium is = 1