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| Ionization Energy (IE) KJ/mole |
| 1 (1A) |
2 (2A) |
13 (3A) |
14 (4A) |
15 (5A) |
16 (6A) |
17 (7A) |
18 (8A) |
| H 1311 |
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He 2372 |
| Li 520 |
Be 899 |
B 800 |
C 1086 |
N 1402 |
O 1314 |
F 1681 |
Ne 2080 |
| Na 496 |
Mg 738 |
Al 577 |
Si 786 |
P 1012 |
S 999 |
Cl 1256 |
Ar 1520 |
| K 0.8 |
Ca 1.0 |
Ga 1.6 |
Ge 1.8 |
As 2.0 |
Se 2.4 |
Br 2.8 |
Kr 0 |
| Rb 0.8 |
Sr 1.0 |
In 1.7 |
Sn 1.8 |
Sb 1.9 |
Te 2.1 |
I 2.5 |
Xe 0 |
| Cs 0.7 |
Ba 0.9 |
Tl 1.8 |
Pb 1.9 |
Bi 1.9 |
Po 2.0 |
At 2.2 |
Rn 0 |
| Fr 0.7 |
Ra 0.9 |
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Notes:
1. The d-block and f-block elements are not shown (do not have electronegativity values)
2. First row indicates the names of the column (also called groups or family)
(Ex. 1(1A) indicates Group 1 or sometimes called Group 1A)