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2. Atoms and the Periodic Table - Part 3 of 3
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2. Atoms and the Periodic Table - Part 3 of 3
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2. Atoms and the Periodic Table / The Electron Configuration (Simplified) / Problem 2
Identify which has an incorrect ground-state electron configuration.
A
Xe: [Kr] 4d
10
5s
2
5p
6
B
Cd: [Kr] 4d
10
5s
2
C
Sr: [Kr] 4s
2
D
Tc: [Kr] 3d
7
E
Na: 1s
2
2s
2
2p
6
3s
1
0
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