# Electron Affinity Chart of All Elements (With Periodic Table)

This is a periodic table with electron affinity values mentioned on it.
The values of electron affinity are given in kJ/mol. The values that are written in parentheses (   ) are the predicted values.

You can also see the electron affinity values of all the elements in the table given below.

But before that, you need to understand some important concepts regarding electron affinity.

What is Electron Affinity?
Electron affinity is the amount of energy change (ΔE) that occurs when an electron is added in the outermost shell of an isolated gaseous atom.

In simple words, when the electron is added to the neutral atom, the energy is either absorbed or released. This amount of energy change (ΔE) is the electron affinity of that atom.

The change in energy (ΔE) can be either positive, negative or zero.

The sign of electron affinity (EEA) is opposite to the sign of energy change (ΔE).

EEA = – (ΔE)

So, if ΔE is positive, then EEA will be negative and if ΔE is negative, then EEA will be positive.

Points to remember:

• For exothermic reaction (i.e when energy is released), the change in energy (ΔE) is negative. Hence the sign of Electron Affinity (EEA) will be positive.
• For endothermic reaction (i.e when energy is absorbed), the change in energy (ΔE) is positive. Hence the sign of Electron Affinity (EEA) will be negative.
• For neutral process (i.e when energy is neither absorbed nor released), the value of Electron Affinity (EEA) will be zero.

More the positive values of Electron Affinity (EEA), more is the energy released.

The halogens (group 17 elements) show more positive values of electron affinity (EEA). This simply indicates that more energy is released in case of halogens when the electron is added to the neutral atom.

## Electron Affinity Chart of All Elements of Periodic Table

Electron affinity chart for all the elements of periodic table is shown in the below table.

These values are in kJ/mol and the values written in parentheses (   ) are the predicted values.

## External resources:

1. Electron affinity | physics. (n.d.). Encyclopedia Britannica. https://www.britannica.com/science/electron-affinity
2. Union of Pure and Applied Chemistry (IUPAC), T. I. (n.d.). IUPAC – electron affinity (E01977). IUPAC – Electron Affinity (E01977). https://goldbook.iupac.org/terms/view/E01977
3. Electron affinity – Wikipedia. (n.d.). Electron Affinity – Wikipedia. https://en.wikipedia.org/wiki/Electron_affinity
4. Ionization Energy and Electron Affinity. (n.d.). Ionization Energy and Electron Affinity. https://chemed.chem.purdue.edu/genchem/topicreview/bp/ch7/ie_ea.html
5. Electron affinity (data page) – Wikipedia. (2018, January 15). Electron Affinity (Data Page) – Wikipedia. https://en.wikipedia.org/wiki/Electron_affinity_(data_page)
Author
##### Jay Rana

Jay is an educator and has helped more than 100,000 students in their studies by providing simple and easy explanations on different science-related topics. With a desire to make learning accessible for everyone, he founded Knords Learning, an online chemistry learning platform that provides students with easily understandable explanations.