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Table 2.
Se V–X electron configurations.
| Even | Odd | |
|---|---|---|
| Se V | 3d10 4s2 | 3d10 4s 4p |
| 3d10 4p2 | 3d10 4s 5p | |
| 3d10 4s 4d | 3d10 4s 4f | |
| 3d10 4s 5s | 3d10 4p 4d | |
| 3d10 4p 4f | 3d10 4p 5s | |
| 3d10 4p 5p | ||
| Se VI | 3d10 4s | 3d10 4p |
| 3d10 4d | 3d10 5p | |
| 3d10 5s | 3d10 4f | |
| Se VII | 3d10 | 3d9 4p |
| 3d9 4d | 3d9 5p | |
| 3d9 4s | 3d9 4f | |
| 3d9 5s | ||
| Se VIII | 3s2 3p6 3d9 | 3s2 3p5 3d10 |
| 3s2 3p6 3d8 4s | 3s2 3p6 3d8 4p | |
| Se IX | 3s2 3p6 3d8 | 3s2 3p5 3d9 |
| 3s2 3p6 3d7 4s | 3s2 3p6 3d7 4p | |
| Se X | 3s2 3p6 3d7 | 3s2 3p5 3d8 |
| 3s2 3p6 3d6 4s | 3s2 3p6 3d6 4p | |
Notes. MR sets of Se V–X with fixed core [Ar] for Se V, VI and VII, and [Ne] for Se VIII-X. In Se V the same {5s,5p,4d,4f} orbital symmetry was kept, while in VI and VII it was broken to ensure convergence. In the cases of Se VIII-X, the new orbital symmetry is {5s, 5p, 4d}.
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