Question

Elements belonging to the same group have the same valency.

Hint:

The valency of an element is related to the number of valence electrons in its outermost shell. Elements in the same group share the same number of valence electrons, hence they have the same valency.

Answer 1

Elements in the same group of the periodic table have the same number of valence electrons. Since valency is determined by the number of electrons an atom can lose, gain, or share to complete its outer electron shell, elements in the same group exhibit the same valency. For example, all elements in Group 1 (alkali metals) have a valency of 1, and all elements in Group 17 (halogens) have a valency of 1 as well.