1s² 2s² 2p⁵

Here's how to understand it:

* 1s²: The first energy level (n=1) has one sublevel, the 's' sublevel, which can hold up to 2 electrons. So, fluorine has 2 electrons in its 1s orbital.

* 2s²: The second energy level (n=2) also has an 's' sublevel, holding another 2 electrons.

* 2p⁵: The second energy level has a 'p' sublevel, which can hold up to 6 electrons. Fluorine has 5 electrons in its 2p orbitals.

Let me know if you'd like a more detailed explanation of electron configurations!