Question

Define Valency.
Find the valency of an element whose atomic number is 12.

Answer 1

Answer:

It has 2 electrons in its outermost shell (M shell). ... Since one atom of the element loses 2 electrons to achieve the inert gas electron configuration, so its valency is 2. It is divalent. (The element having atomic number 12 is actually magnesium).

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Answer 2

Valency is the number of electrons from an atom can accept or give from the last shell of an atom in order to attain a stable electron configuration. The electronic configuration of the element will be 2,8,2, so the valency is 2 positive as the atom will give electron. Those which gain electrons are negative.
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