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| Ion | No. of levels |
|---|
| Fe I | 847 |
| Fe II | 1028 |
| Fe III | 596 |
| Fe IV | 277 |
| Fe V | 332 |
| Fe VI | 94 |
| Fe VII | 210 |
| Fe VIII | 42 |
| Fe IX | 35 |
| Fe X | 65 |
| Fe XI | 67 |
| Fe XII | 77 |
| Fe XIII | 50 |
| Fe XIV | 72 |
| Fe XV | 72 |
| Fe XVI | 80 |
| Fe XVII | 67 |
| Fe XVIII | 71 |
| Fe XIX | 64 |
| Fe XX | 63 |
| Fe XXI | 50 |
| Fe XXII | 61 |
| Fe XXIII | 73 |
| Fe XXIV | 51 |
| Fe XXV | 92 |
| Fe XXVI | 50 |
| Total for Fe: | 4586 |