| Atom | EA (kJ/mol) | Atom | EA (kJ/mol) | Atom | EA (kJ/mol) | Atom | EA (kJ/mol) |
| H | 73 | O | 142 | P | 75 | Cu | 118 |
| Li | 59 | F | 332 | S | 200 | Br | 323 |
| B | 29 | Na | 52 | Cl | 349 | I | 295 |
| C | 121 | Al | 50 | K | 48 | Se | 195 |
| N | 4 | Si | 134 | Ti | 20 | Te | 190 |
O-(g) + e- = O2-(g) ΔHº = 798 kJ/mol
S-(g) + e- = S2-(g) ΔHº = 640 kJ/mol
aElectron affinities are defined as heat liberated (e.g., ΔHº for H(g) + e- =
H-(g) is -73 kJ/mol).