Write the distribution of electrons in carbon and sodium atoms.

The total number of electrons in a carbon atom is $6$. The distribution of electrons in a carbon atom is given by:
First orbit or $K$-shell $= 2$ electrons
Second orbit or $L$-shell $= 4$ electrons
Thus,the electron distribution in a carbon atom is $2, 4$.
The total number of electrons in a sodium atom is $11$. The distribution of electrons in a sodium atom is given by:
First orbit or $K$-shell $= 2$ electrons
Second orbit or $L$-shell $= 8$ electrons
Third orbit or $M$-shell $= 1$ electron
Thus,the electron distribution in a sodium atom is $2, 8, 1$.