Question

Write the number of valence electrons present in a nitrogen atom ${}_7{}^{14}\mathrm{N}$?

Answer 1

Valence electrons in ${}_7{}^{14}\mathrm{N}$ :

• Valence electrons are the electrons present in the outermost shell of an atom.
• ${}_7{}^{14}\mathrm{N}$ isotope of nitrogen consists of $7$ electrons, $7$ protons, and $7$ neutrons.
• The electronic configuration of Nitrogen having atomic number $7$ is $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^3$.
• The outermost shell i.e. $\mathrm{n}=2$ has $2+3=5$ electrons.

Hence, the number of valence electrons present in a nitrogen atom ${}_7{}^{14}\mathrm{N}$ is $\mathbf{5}$.