Question
Write the electronic configurations of the elements with the atomic numbers $61, 91, 101,$ and $109.$
✓
Answer
| Atomic number | Electronic configuration |
| $61$ | $[Xe]^{54}\ 4f^5\ 5d^06s^2$ |
| $91$ | $[Rn]^{85}\ 5f^{13}\ 6d^17s^2$ |
| $101$ | $[Rn]^{86}\ 5f^{13}\ 5d^07s^2$ |
| $109$ | $[Rn]^{86}\ 5f^{14}\ 6d^17s^2$ |
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