The fluorine ion, F, has one more electron than a neutral fluorine atom. a) How many pea-halves do you need?
b) Fill the sublevels in the correct order for the fluorine ion and write the electron configuration for the charged atom.

a) three pea halves

b) Electron configuration of the fluorine ion 1s2 2s2 2p6

Explanation:

The fluorine atom has seven electrons in its outermost shell and a total of nine electrons occupying three shells.

In the fluoride ion, the fluorine atom accepts one more electron to complete its outermost shell configuration (to have a filled shell as shown).

Hence the fluoride ion has 10 electrons with an electronic configuration of 1s2 2s2 2p6.

c. 4.54 x 10–12 j happens to be correct