# Electrons in atoms

### By J, Electron Configuration and Orbital Notation page 6

## Electron configuration

electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s2 2s2 2p6.

## Steps to writing and finding the electron configuration

- Find how many electrons are in an atom
- Determine the principal energy level (n) of the atom
- Determine the number of sub-levels
- Assign electrons to the sub-levels following the three rules (Aufbau, Pauli exclusion, and Hund's)
- Write the complete electron configuration
- Follow the arrows diagonally
- loop back up to the next diagonal row and continue the method

## Orbital Notation

Orbital notation is another way of expressing the electron configuration of an atom. It is useful in determining quantum numbers as well as electron pairing

## Orbital Notation

- S level (holds 2)
- P level (holds 6)
- D Level (holds10)
- F level (holds14)

## Orbital notation guide

School bus theory". In this theory he stated that Electrons will fill up the empty orbitals before pairing up with each other which produces more stability within the atom. However each sub level has a certain amount of orbitals.