Question

Describe the orbital notation and electron configuration notation to describe the placement of all of the electrons in an atom of Fluorine.

Answer 1

fluorine has the configuration: \(\sf \color{blue}{1s^2 2s^2 2p^5}\) or you can also write: \(\sf \color{violet}{[He]}2s^22p^5\)

Answer 2

You start by filling in the 1 s orbital first, then 2s orbital. Remember by pauli exclusion principle, you cannot have same spins on their orbitals.
S is lower in energy than P orbital. so that is why you fill those up first.