# How do you determine the electron configuration of iron?

Dec 23, 2016

Place the 26 electrons of Iron into the electron orbitals starting from the lowest energy level to the next highest until all 26 have been used. ( $1 {s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{6} 4 {s}^{2} 3 {d}^{6}$)

#### Explanation:

1s is the lowest energy level and can hold 2 electrons.
2s is next and can hold 2 electrons total of 4
2p is next and can hold 6 electrons total of 10
3s is next and can hold 2 electrons total of 12
3p is next and can hold 6 electrons total of 18
4s is next and can hold 2 electrons total of 20
3d is next and can hold all 6 remaining electrons total 26
(3d can hold up to 10 electrons.)