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| Ion | No. of levels |
|---|
| Np I | 2 |
| Np II | 2 |
| Np III | 2 |
| Np IV | 2 |
| Np V | 2 |
| Np VI | 2 |
| Np VII | 2 |
| Np VIII | 2 |
| Np IX | 2 |
| Np X | 2 |
| Np XI | 2 |
| Np XII | 2 |
| Np XIII | 2 |
| Np XIV | 2 |
| Np XV | 2 |
| Np XVI | 2 |
| Np XVII | 2 |
| Np XVIII | 2 |
| Np XIX | 2 |
| Np XX | 2 |
| Np XXI | 2 |
| Np XXII | 2 |
| Np XXIII | 2 |
| Np XXIV | 2 |
| Np XXV | 2 |
| Np XXVI | 2 |
| Np XXVII | 2 |
| Np XXVIII | 2 |
| Np XXIX | 2 |
| Np XXX | 2 |
| Np XXXI | 2 |
| Np XXXII | 2 |
| Np XXXIII | 2 |
| Np XXXIV | 2 |
| Np XXXV | 2 |
| Np XXXVI | 2 |
| Np XXXVII | 2 |
| Np XXXVIII | 2 |
| Np XXXIX | 2 |
| Np XL | 2 |
| Np XLI | 2 |
| Np XLII | 2 |
| Np XLIII | 2 |
| Np XLIV | 2 |
| Np XLV | 2 |
| Np XLVI | 2 |
| Np XLVII | 2 |
| Np XLVIII | 2 |
| Np XLIX | 2 |
| Np L | 2 |
| Np LI | 2 |
| Np LII | 2 |
| Np LIII | 2 |
| Np LIV | 2 |
| Np LV | 2 |
| Np LVI | 2 |
| Np LVII | 2 |
| Np LVIII | 2 |
| Np LIX | 2 |
| Np LX | 2 |
| Np LXI | 2 |
| Np LXII | 2 |
| Np LXIII | 2 |
| Np LXIV | 2 |
| Np LXV | 2 |
| Np LXVI | 2 |
| Np LXVII | 2 |
| Np LXVIII | 2 |
| Np LXIX | 2 |
| Np LXX | 2 |
| Np LXXI | 2 |
| Np LXXII | 2 |
| Np LXXIII | 2 |
| Np LXXIV | 2 |
| Np LXXV | 2 |
| Np LXXVI | 2 |
| Np LXXVII | 2 |
| Np LXXVIII | 2 |
| Np LXXIX | 2 |
| Np LXXX | 2 |
| Np LXXXI | 2 |
| Np LXXXII | 2 |
| Np LXXXIII | 2 |
| Np LXXXIV | 2 |
| Np LXXXV | 2 |
| Np LXXXVI | 2 |
| Np LXXXVII | 2 |
| Np LXXXVIII | 2 |
| Np LXXXIX | 2 |
| Np XC | 2 |
| Np XCI | 4 |
| Np XCII | 9 |
| Np XCIII | 10 |
| Total for Np: | 203 |