Enter the energy of the system with an electron and the energy of the anion into the Electron Affinity Calculator. The calculator will evaluate the Electron Affinity.

## Electron Affinity Formula

The following two example problems outline the steps and information needed to calculate the Electron Affinity.

EA = Ee - Ea

Variables:

- EA is the Electron Affinity ( )
- Ee is the energy of the system with an electron
- Ea is the energy of the anion

To calculate the electron affinity, subtract the energy of the anion from the energy of the system.

## How to Calculate Electron Affinity?

The following steps outline how to calculate the Electron Affinity.

- First, determine the energy of the system with an electron.
- Next, determine the energy of the anion.
- Next, gather the formula from above = EA = Ee – Ea.
- Finally, calculate the Electron Affinity.
- After inserting the variables and calculating the result, check your answer with the calculator above.

**Example Problem : **

Use the following variables as an example problem to test your knowledge.

energy of the system with an electron = 5

energy of the anion = 3

EA = Ee – Ea** **= ?