Question

An element A belongs to the third period and group 1 of the periodic table. Find out :

i. The number of valence electrons in its atoms.

ii. Valency of the element.

iii. Name of the element.

Answer 1

i. Since element A belongs to group 1, it has 1 valence electron in its atom.

ii. The valency of group 1 elements is 1. So the valency of element A is 1.

iii. The first element of third period is sodium. So the element A is sodium (Na).