Question

A, B, C, D are four elements. The electronic configuration is given below and find the answers in the following (Hint. The symbols are not real) 

A – 2, 2 

B – 2, 8, 5 

C – 2, 7 

D – 2, 8, 2 

a) Find the elements belongs to same period?

b) Find the elements belongs to same group. 

c) ‘C’ belongs to which period and group?

Answer 1

a) B, D, and A, C because the number of shells are same. 

b) A, D because the number of electrons in the outermost shell is same. 

c) ‘C’ belongs to second period and 17^th group