Any five differences between valency and oxidation number.

The key difference between valency and oxidation number is that valency is the maximum number of electrons an atom can lose, gain or share to become stable,

Explanation: whereas oxidation number is the number of electrons an atom can lose or gain to form a bond with another atom.

answer; (d) constructive and destructive force;

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.