Question

The valence of Sodium with atomic number 11 is _____.

Answer 1

1. The number of electrons that an atom needs to lose or gain in order to achieve a stable electron configuration is known as the valency of an element, which serves as a gauge of that element's potential for combining.
2. Sodium ($\mathrm{Na}$) has an atomic number of 11, and its electronic configuration is:

$\mathrm{Na}(\mathrm{Z}=11)=1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^1$

Hence, the valence of Sodium with atomic number 11 is 1.