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Question
Write the electronic configurations of the elements with the atomic numbers 61, 91, 101 and 109.
Solution
| Atomic number | Element Name | Symbol | Electronic configuration |
| 61 | Promethium | Pm | [Xe]54 4f5 5d0 6s2 |
| 91 | Protactinium | Pa | [Rn]86 5f2 6d1 7s2 |
| 101 | Mendelevium | Md | [Rn]86 5f13 6d0 7s2 |
| 109 | Metanerium | Mt | [Rn]86 5f14 6d7 7s2 |
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