Question

The electronic configuration of the element X, Y, and Z are given below, a) X = 2, 5 b) Y = 2, 8, 1 c) Z = 2, 8 

i) Which element belongs to 18th group? 

ii) Which element belongs to 15th or V group? 

iii) Which element belongs to third period?

Answer 1

i) Z belongs to 18th group because it is a noble gase (i.e. Ne). 

ii) X belongs to 15th or V group because it has 5 valence electrons. 

iii) Y belongs to 3rd period because the valence electron is present in 3 orbit.