## Configurations

VictoriaRoderick_3A
Posts: 42
Joined: Fri Sep 25, 2015 3:00 am

### Configurations

I am confused on what number means what during an electronic configuration.

So, the first number is the energy level and the row number ( and d is one behind)?

The letter tells what orbital the electron is in?

The number tells how many electrons are in the orbitals and whether they are paired or parallel?

Pauline Tran 2G
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

### Re: Configurations

The number in front of the letter refers to the row that the element is on. The letter is the atomic orbital that the element is in. The superscript (or exponent-like number) refers to the number of electrons assigned to that orbital.

So for example, lithium would be $1s^{2}2s^{1}$ because of the 2 electrons in the 1s-subshell and the one electron in the 2s-subshell.