Question

Write electronic configuration for the following elements:
(i) Sodium
(ii) Chlorine

Hint:

To write the electronic configuration, follow the Aufbau principle and fill orbitals in order of increasing energy.

Answer 1

(i) The electronic configuration of Sodium (Na) is:
\[ \text{Na: 1s}^2 \, \text{2s}^2 \, \text{2p}^6 \, \text{3s}^1 \]
(ii) The electronic configuration of Chlorine (Cl) is:
\[ \text{Cl: 1s}^2 \, \text{2s}^2 \, \text{2p}^6 \, \text{3s}^2 \, \text{3p}^5 \]