Q22 of 31 Page 198

An element X belongs to 3rd period and group 2 of the periodic table. State

(a) The no. of valence electrons


(b) The valency


(c) Whether it is metal or a nonmetal.

Given: X belongs to 3rd period and second group


a) As the period number is three (2s2 2p1) thus, the number of valence electron = 1


b) The valency is total number of electrons in the outermost shell. Thus, its valency is 1.


c) X is a non-metal


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