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| Ionization Energy (IE) |
| 1 (1A) |
2 (2A) |
13 (3A) |
14 (4A) |
15 (5A) |
16 (6A) |
17 (7A) |
18 (8A) |
| H 1311 |
|
|
|
|
|
|
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 419 |
Ca 590 |
Ga 579 |
Ge 761 |
As 947 |
Se 941 |
Br 1143 |
Kr 1351 |
| Rb 403 |
Sr 549 |
In 558 |
Sn 708 |
Sb 834 |
Te 869 |
I 1009 |
Xe 1170 |
| Cs 376 |
Ba 503 |
Ti 589 |
Pb 715 |
Bi 703 |
Po 813 |
At (926) |
Rn 1037 |
| Fr DK |
Ra DK |
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Notes:
1. The d-block and f-block elements are not shown and DK is Do not know or find value.
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)
3. Ionization energy values above are in KJ/mole.