Question

Write the electronic configuration of alkali metals.

Answer 1

Alkali metals:

• The alkali metals are located on the left side of the periodic table.
• They belong to $\mathrm{group}-1$.
• They are $\mathrm{s}-$block elements.
• The elements include $\mathrm{H},\mathrm{Li},\mathrm{Na},\mathrm{K},\mathrm{Rb},\mathrm{Cs}\&\mathrm{Fr}$.

Electronic configuration:

• The general electronic configuration of alkali metals is $n{s}^1$.
• Where $\mathrm{n}$is the principal quantum number i.e. $n=1,2,3,..$which differs for different elements in the alkali metals.
• For hydrogen, the electronic configuration is $1s^1$.
• For lithium, the electronic configuration is $\left[\mathrm{He}\right]\mathit{2}{s}^{\mathit{1}}$.
• For sodium, the electronic configuration is $\left[\mathrm{Ne}\right]3s^1$.
• For potassium, the electronic configuration is $\left[\mathrm{Ar}\right]4s^1$.
• For rubidium, the electronic configuration is $\left[\mathrm{Kr}\right]5s^1$.
• For caesium, the electronic configuration is $\left[\mathrm{Xe}\right]6s^1$.