Electronic Configuration and Oxidation States

Q.

What is the oxidation number of $\mathrm{N}$ in ${\mathrm{NO}}_3^{-}$?

Q.

(a) how many sub-shells are associated with $\mathrm{n}=4$? (b) how many electrons will be present in the sub-shells having ${\mathrm{m}}_{\mathrm{s}}$value of $-1/2\mathrm{for}\mathrm{n}=4?$

Q.

Nitrogen has the electronic configuration $1s^2,2s^{2}2p_x^{1}2p_y^{1}2p_z^1$ and not $1s^2,2s^{2}2p_x^{2}2p_y^{1}2p_z^0$ which is determined by

1. Hund's rule

2. Pauli's exclusion principle

3. Aufbau's principle

4. Uncertainty principle

Q. The valency of nitrogen in $N{H}_3$ is:

Q. how many noble gases are present in the world?

Q. which of these elements forms a diatomic molecule- carbon, bromine, sulphur or phosphorus