1s² 2s² 2p⁶ 3s² 3p⁴

Explanation:

* 1s²: The first energy level (n=1) has one subshell, the 's' subshell, which can hold up to 2 electrons.

* 2s²: The second energy level (n=2) has two subshells, 's' and 'p'. The 's' subshell holds 2 electrons.

* 2p⁶: The 'p' subshell in the second energy level can hold up to 6 electrons.

* 3s²: The third energy level (n=3) also has 's' and 'p' subshells. The 's' subshell holds 2 electrons.

* 3p⁴: The 'p' subshell in the third energy level is partially filled with 4 electrons.

Important Note: This configuration represents the ground state of a neutral sulfur atom. The electron configuration of ions will be different.