An element belongs to the 3rd period and 2nd group of the periodic table. Find out the valence electrons and valency of this element.
The valency of an atom refers to the number of electrons present in the outermost shell.
The element in the 3rd period and 2nd group is Magnesium (Mg). Its configuration is 2, 8, 2 which shows that its outermost shell has 2 valence electrons and its valency is 2.