Question
Write the electronic configurations of the elements with the atomic numbers 61, 91, 101, and 109.
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Answer
| Atomic number | Electronic configuration |
| 61 | [Xe]54 4f5 5d0 6s2 |
| 91 | [Rn]85 5f13 6d1 7s2 |
| 101 | [Rn]86 5f13 5d0 7s2 |
| 109 | [Rn]86 5f14 6d1 7s2 |
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