Write the electronic configuration of any one pair of isotopes and isobars.

Explanation

Two isotopes of carbon are `._(6)^(12)C` and `._(6)^(14)C`
The electronic configuration of `._(6)(12)C` and .
The electronic configuration of `._(6)^(14)C` and is 2,4
[Isotopes have same electronic configuration]
`._(29)^(40)C` a and `._(18)^(40)Ar` are a pair of isobars
The electronic configuration of `._(29)(40)C`a is 2,8,8,2
The electronic configuration of `._(18)^(40)Ar` is 2,8,8.
[Isobars have different electronic configuration]