Question

Consider the elements $\mathrm{Na}$, $\mathrm{Mg}$ and $\mathrm{Al}$ and their respective atomic numbers $11$, $12$ and $13$. Write the electronic configuration of each.

Answer 1

Electronic configuration:

1. The arrangement of electrons in the atomic orbitals of elements is characterized by electronic configuration.
2. The atomic numbers are filled in the K shell which can bear up to 2 electrons, the L shell which can bear up to 8 electrons and the M shell which can bear up to 18 electrons and so on.
3. The atomic number of Sodium $\left(\mathrm{Na}\right)$ is $11$ and the electronic configuration is $\mathrm{Na}-2,8,1$
4. The atomic number of magnesium $\left(\mathrm{Mg}\right)$ is $12$ and the electronic configuration is $\mathrm{Mg}-2,8,2$
5. The atomic number of Aluminium $\left(\mathrm{Al}\right)$ is $13$ and the electronic configuration is $\mathrm{Al}-2,8,3$