Question

How many total valence electrons are available in ion ${{\mathrm{NO}}_3}^{-}$?

Answer 1

Valence electron:

1. A valence electron is an electron in the outer shell of an atom that can participate in the creation of a chemical bond.
2. More is the valence electron, and the greater is the stability of the atom.
3. The amount of valence electrons in a molecule is computed by adding the number of valence electrons in each of the atoms that make up the molecule.
4. In ${{\mathrm{NO}}_3}^{-}$ there is one nitrogen atom and three oxygen atoms along with a single negative charge.
5. Electronic configuration of Nitrogen$=1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^3$ therefore, valence electron$=5$
6. Electronic configuration of Oxygen$=1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^4$ therefore, valence electron given by three oxygen atom$=6\times 3\Rightarrow 18$
7. The total number of valence electrons $=18+5+1\Rightarrow 24$ one extra electron for the negative charge on the compound.

Therefore, there are $24$ valence electrons in ${{\mathrm{NO}}_3}^{-}$.