which diagram shows the correct electron configuration for fluorine (f)?

Brief Explanations:

Fluorine has an atomic number of 9. Its electron - configuration follows the Aufbau principle, Pauli exclusion principle, and Hund's rule. The first 2 electrons fill the 1s orbital, the next 2 fill the 2s orbital, and the remaining 5 electrons fill the 2p orbitals. According to Hund's rule, electrons first singly occupy degenerate orbitals before pairing up. So, the 2p sub - shell has 3 orbitals and 5 electrons will fill them as 2 paired and 1 unpaired.

Answer:

The first option (where 1s has 2 electrons, 2s has 2 electrons, and 2p has 5 electrons with 2 paired and 1 unpaired) shows the correct electron - configuration for fluorine.