Write a note on the variation of metallic nature in a group and in a period.

Explanation

Metals shows electropositive nature (i.e.,) loss of electrons and form positive ions.
Non-metals shows electronegative nature (i.e.,) gain of electrons and form negative ions.
Periodicity:
(a) Down the group: Going down a group of the periodic table, the tendency to form positive ioins, increases. That means there is an increase in metallic nature as the size of atom increases down the group.
(b) Along a period: From left to right in a period, size of atom decreases. So there is decrease in metallic nature.