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| Ion | No. of levels |
|---|
| Sr I | 380 |
| Sr II | 72 |
| Sr III | 150 |
| Sr IV | 255 |
| Sr V | 144 |
| Sr VI | 22 |
| Sr VII | 20 |
| Sr VIII | 21 |
| Sr IX | 31 |
| Sr X | 47 |
| Sr XI | 52 |
| Sr XII | 50 |
| Sr XIII | 74 |
| Sr XIV | 40 |
| Sr XV | 2 |
| Sr XVI | 2 |
| Sr XVII | 2 |
| Sr XVIII | 2 |
| Sr XIX | 10 |
| Sr XX | 10 |
| Sr XXI | 5 |
| Sr XXII | 8 |
| Sr XXIII | 10 |
| Sr XXIV | 12 |
| Sr XXV | 21 |
| Sr XXVI | 29 |
| Sr XXVII | 35 |
| Sr XXVIII | 63 |
| Sr XXIX | 66 |
| Sr XXX | 12 |
| Sr XXXI | 11 |
| Sr XXXII | 16 |
| Sr XXXIII | 21 |
| Sr XXXIV | 19 |
| Sr XXXV | 13 |
| Sr XXXVI | 41 |
| Sr XXXVII | 80 |
| Sr XXXVIII | 50 |
| Total for Sr: | 1898 |