Question

valency of an element in group 2 and group 15 in periodic table. give reason​

Answer 1

Explanation:

(a) The number of valence electrons in X is 2. For groups 1 and 2, the number of valence electrons is equal to the group number.

(b) The valency of X is 2. Valency is determined by the number of valence electrons present in the atom of the element.

(c) The number of valence electrons in Y is 5. For groups 13 to 18, the number of valence electrons is equal to (group no - 10).

(d) The valency of Y is 3. The number of electrons lost or gained by one atom of an element to achieve the nearest inert gas configuration gives us the valency.

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