1s² 2s² 2p⁶ 3s² 3p⁴

Here's how we arrive at this:

* Sulfur (S) has an atomic number of 16, meaning it has 16 protons and 16 electrons.

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

* 2s²: The second energy level (n=2) has one s subshell which can hold up to 2 electrons.

* 2p⁶: The second energy level also has a p subshell which can hold up to 6 electrons.

* 3s²: The third energy level (n=3) has one s subshell which can hold up to 2 electrons.

* 3p⁴: The third energy level also has a p subshell which can hold up to 6 electrons. In the case of sulfur, it only has 4 electrons in this subshell.

Let me know if you'd like the shorthand electron configuration or have any other questions!