Q. 85.0( 4 Votes )

The electronic configuration of four elements A,B,C and D is given as follows:

A-2,8 B-2,8,1

C-2,8,2 D-2,8,8

a. Which of them belong to the same period? Name the period.

b. Which of them belong to the same group? Name the group.

Answer :

(a) We know that elements with same number of shells are placed in same period and period is equal to the number of shells contain. So elements B, C and D belong to same period and the period is 3.

(b) We know that those elements which have same electrons in outermost shell belong to same group. So elements A and D belong to same group. And there are 8 electrons in outermost shell so the group is 18.

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