Question

What is the number of the valence electrons in Sodium ion $\left({\mathrm{Na}}^{+}\right)$ ?

Answer 1

Valence electrons

• “The electrons present in the outermost shell of an atom are known as valence electrons.”

Valence electrons in Sodium ion $\left({\mathrm{Na}}^{+}\right)$:

• The atomic number of Sodium is 11.
• The electronic configuration of Sodium is $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^1$.
• As Sodium loses its electron it forms a Sodium ion$\left({\mathrm{Na}}^{+}\right)$and the total number of electrons are 10.
• The electronic configuration is as follows:

$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^6$

• The number of valence electrons is $8$, as the octet is complete.