Electron Affinity

1. Electron Affinity
Dr. Mithil Fal Desai
Shree Mallikarjun and Shri Chetan Manju Desai College
Canacona Goa

2. e-
A
Energy
-
Electron Affinity (EA)
A(g) + e-  A-
(g) + Energy

3. Periodic trend in Electron Affinity

4. e-
e-e-
e-
e-
e- e-
e-
e-e-
e-
e-
e-
e-
e-
e-
e-
e-
e-
e-
e-
e-
e-
e-
e-
e-
F
1s2, 2s2, 2p5
Cl
1s2, 2s2, 2p5, 3s2, 3p5
Why chlorine has higher electron affinity than fluorine?

5. Electron Affinity
Energy released when an extra
electron is added to a neutral gaseous
atom
Atomic number increases
• EA decreases down the group
• EA increases along the row