Chlorine has a valency of 1, as it requires one more electron to complete its octet and achieve stability.

The electronic configuration of chlorine (atomic number 17) is 1s² 2s² 2p⁶ 3s² 3p⁵.

Shared electrons create a stable configuration for each atom involved in the bond, leading to the stability of the molecule as a whole.

Shared electrons create a stable configuration for each atom involved in the bond, leading to the stability of the molecule as a whole.

After forming H2, each hydrogen atom attains the electronic configuration of helium, which has two electrons in its K shell, making it more stable.