Question

An element $X$ belongs to 3rd period and group 2 of the periodic table. State:
(a) The number of valence electrons
(b) The valency
(c) Whether it is metal or a nonmetal.

Answer 1

The element which belongs to 3rd period and group 2 is Magnesium.

Its electronic configuration is $\left[Ne\right]3s^2$

i) The no. of valence electrons =2

ii) Valency =2

iii) It is a metal as it belongs to the s-block.