To write the ground state electron configuration of any element:

1. Determine number of electrons. This is equal to the atomic number (Z) for any neutral atom. Here, nitrogen has an atomic number of 7
2. Add electrons to the following order of orbital taking note the maximum occupancy for each orbital: 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5d 6p 7s 5f 6d 7p​

Answer

1s²2s²2p⁶3s²3p⁴

Explanation 

Ground state electron configuration is the arrangement of electrons around the nucleus of an atom with lower energy levels. Electrons occupying the orbitals of different energy levels naturally fall towards the lowest energy state or ground state.

The total number of electrons in the S atom is 16 electrons. The configuration puts all 16 electrons in orbitals around the nucleus of the Sulfur atom. The ground state electron configuration neutral sulfur is 1s²2s²2p⁶3s²3p⁴ or [Ne].3s².3p⁴ 

The configuration notation provides easy way for one to communicate how electrons are arranged around the nucleus of an atom.