Question

Given below are the electronic configurations of some elements:

(a) 2,8,3

(b) 2,8,18,5

(c) 2,8,7

(d) 2,8,18,8,1

(e) 2,8,2

(f) 2,5

(g) 2,8,18,8

Answer the following:

(f) which elements belong to the same group?

Answer 1

The elements belonging to the same group are:

1. The groups in a periodic table extend vertically downwards.
2. The elements belonging to the same group have same properties.
3. They also have same number of electrons in their valence shell. Down the group the number of shells increases but the number of valence electron remain the same.
4. The valence electrons present are equal to the group number.
5. The elements having electronic configurations 2, 8, 18, 5 and 2, 5 belongs to the same group as they both have 5 valence electrons.