Periodic Table Trends - Electron Affinity

Related Topics:
More Lessons for Chemistry

Math Worksheets

This is a series of lectures in videos covering Chemistry topics taught in High Schools.

What is Electron Affinity?
Electron Affinity measure the change in energy that occurs when an electron is added to the outer energy level of an atom to form a negative ion. If energy is released when an atom gains an electron, the electron affinity would be shown as a negative number.

What are the Trends for Electron Affinity?
Electron affinity tends to decrease down a group.
Electron affinity tends to increase across a period.

Periodic Table Trends: Electron Affinity
The following looks at the trends related to Atomic size. Periodic Trends -Affinity Overview: Atomic Size, Ionization Energy & Electron Affinity
The following looks at the trends related to Atomic size. Electron Affinity - Chemistry Tutorial
This chemistry tutorial describes the concept of electron affinity and covers the general periodic trend of electron affinity along with notable exceptions in this trend.