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Electron
Configurations That Differ from Predicted Configurations
Some of the elements
have electron configurations that differ slightly from what our general
procedure would lead us to predict. Because a few of these elements are
important ones, it is useful to know their actual electron
configurations. Six of these are listed on the table below.
Unusual Electron
Configurations
| Element |
Predicted
Electron Configuration |
Actual
Electron Configuration |
| copper, Cu |
[Ar] 3d9
4s2 |
[Ar] 3d10
4s1 |
| silver, Ag |
[Kr] 4d9
5s2 |
[Kr] 4d10
5s1 |
| gold, Au |
[Xe] 4f14
5d9 6s2 |
[Xe] 4f14
5d10
6s1 |
| palladium, Pd |
[Kr] 4d8
5s2 |
[Kr] 4d10 |
| chromium, C
r |
[Ar] 3d4
4s2 |
[Ar] 3d5
4s1 |
| molybdenum, Mo |
[Kr] 4d4
5s2 |
[Kr] 4d5
5s1 |
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