# Master Isotope Table — Known vs Predicted (Z = 1–118)
This ledger shows for each element:
- **Known isotopes** (experimentally observed)
- **Stable (strict)** isotopes (per IUPAC; ultra-long-lived treated as radioactive)
- **Unstable isotopes** (= Known − Stable)
- **Predicted isotopes** (scaled to Neufcourt et al. 2020 central estimate: 7,759 total bound nuclides)
- **Gap** (Predicted − Known)
---
## Totals
- Total elements: 118
- Known isotopes: 3,269
- Stable isotopes (strict): 273
- Unstable isotopes: 2,996
- Predicted isotopes: 7,759
- Total Gap: 4,490
- Scale factor: 2.373509
---
## Table (Z = 1–118)
| Z | Element | Known | Stable (strict) | Unstable | Predicted (est.) | Gap |
|---:|:---:|---:|---:|---:|---:|---:|
| 1 | H | 7 | 2 | 5 | 17 | 10 |
| 2 | He | 9 | 2 | 7 | 21 | 12 |
| 3 | Li | 11 | 2 | 9 | 26 | 15 |
| 4 | Be | 12 | 1 | 11 | 28 | 16 |
| 5 | B | 13 | 2 | 11 | 31 | 18 |
| 6 | C | 15 | 2 | 13 | 36 | 21 |
| 7 | N | 16 | 2 | 14 | 38 | 22 |
| 8 | O | 17 | 3 | 14 | 40 | 23 |
| 9 | F | 18 | 1 | 17 | 43 | 25 |
| 10 | Ne | 19 | 3 | 16 | 45 | 26 |
| 11 | Na | 20 | 1 | 19 | 47 | 27 |
| 12 | Mg | 22 | 3 | 19 | 52 | 30 |
| 13 | Al | 22 | 1 | 21 | 52 | 30 |
| 14 | Si | 23 | 3 | 20 | 55 | 32 |
| 15 | P | 23 | 1 | 22 | 55 | 32 |
| 16 | S | 24 | 4 | 20 | 57 | 33 |
| 17 | Cl | 24 | 2 | 22 | 57 | 33 |
| 18 | Ar | 24 | 3 | 21 | 57 | 33 |
| 19 | K | 24 | 2 | 22 | 57 | 33 |
| 20 | Ca | 24 | 6 | 18 | 57 | 33 |
| 21 | Sc | 25 | 1 | 24 | 59 | 34 |
| 22 | Ti | 26 | 5 | 21 | 62 | 36 |
| 23 | V | 26 | 1 | 25 | 62 | 36 |
| 24 | Cr | 26 | 4 | 22 | 62 | 36 |
| 25 | Mn | 26 | 1 | 25 | 62 | 36 |
| 26 | Fe | 28 | 4 | 24 | 66 | 38 |
| 27 | Co | 29 | 1 | 28 | 69 | 40 |
| 28 | Ni | 31 | 5 | 26 | 74 | 43 |
| 29 | Cu | 29 | 2 | 27 | 69 | 40 |
| 30 | Zn | 30 | 5 | 25 | 71 | 41 |
| 31 | Ga | 31 | 2 | 29 | 74 | 43 |
| 32 | Ge | 32 | 5 | 27 | 76 | 44 |
| 33 | As | 33 | 1 | 32 | 78 | 45 |
| 34 | Se | 30 | 6 | 24 | 71 | 41 |
| 35 | Br | 31 | 2 | 29 | 74 | 43 |
| 36 | Kr | 32 | 6 | 26 | 76 | 44 |
| 37 | Rb | 32 | 1 | 31 | 76 | 44 |
| 38 | Sr | 34 | 4 | 30 | 81 | 47 |
| 39 | Y | 32 | 1 | 31 | 76 | 44 |
| 40 | Zr | 34 | 5 | 29 | 81 | 47 |
| 41 | Nb | 34 | 1 | 33 | 81 | 47 |
| 42 | Mo | 35 | 7 | 28 | 83 | 48 |
| 43 | Tc | 36 | 0 | 36 | 85 | 49 |
| 44 | Ru | 37 | 7 | 30 | 88 | 51 |
| 45 | Rh | 35 | 1 | 34 | 83 | 48 |
| 46 | Pd | 36 | 6 | 30 | 85 | 49 |
| 47 | Ag | 38 | 2 | 36 | 90 | 52 |
| 48 | Cd | 39 | 8 | 31 | 93 | 54 |
| 49 | In | 39 | 2 | 37 | 93 | 54 |
| 50 | Sn | 40 | 10 | 30 | 95 | 55 |
| 51 | Sb | 36 | 2 | 34 | 85 | 49 |
| 52 | Te | 38 | 8 | 30 | 90 | 52 |
| 53 | I | 37 | 1 | 36 | 88 | 51 |
| 54 | Xe | 40 | 9 | 31 | 95 | 55 |
| 55 | Cs | 39 | 1 | 38 | 93 | 54 |
| 56 | Ba | 40 | 7 | 33 | 95 | 55 |
| 57 | La | 39 | 1 | 38 | 93 | 54 |
| 58 | Ce | 40 | 4 | 36 | 95 | 55 |
| 59 | Pr | 39 | 1 | 38 | 93 | 54 |
| 60 | Nd | 41 | 5 | 36 | 97 | 56 |
| 61 | Pm | 39 | 0 | 39 | 93 | 54 |
| 62 | Sm | 41 | 7 | 34 | 97 | 56 |
| 63 | Eu | 40 | 2 | 38 | 95 | 55 |
| 64 | Gd | 41 | 7 | 34 | 97 | 56 |
| 65 | Tb | 39 | 1 | 38 | 93 | 54 |
| 66 | Dy | 40 | 7 | 33 | 95 | 55 |
| 67 | Ho | 39 | 1 | 38 | 93 | 54 |
| 68 | Er | 40 | 6 | 34 | 95 | 55 |
| 69 | Tm | 39 | 1 | 38 | 93 | 54 |
| 70 | Yb | 41 | 7 | 34 | 97 | 56 |
| 71 | Lu | 40 | 1 | 39 | 95 | 55 |
| 72 | Hf | 36 | 5 | 31 | 85 | 49 |
| 73 | Ta | 37 | 1 | 36 | 88 | 51 |
| 74 | W | 35 | 5 | 30 | 83 | 48 |
| 75 | Re | 39 | 1 | 38 | 93 | 54 |
| 76 | Os | 35 | 7 | 28 | 83 | 48 |
| 77 | Ir | 34 | 2 | 32 | 81 | 47 |
| 78 | Pt | 35 | 6 | 29 | 83 | 48 |
| 79 | Au | 36 | 1 | 35 | 85 | 49 |
| 80 | Hg | 38 | 7 | 31 | 90 | 52 |
| 81 | Tl | 39 | 2 | 37 | 93 | 54 |
| 82 | Pb | 43 | 4 | 39 | 102 | 59 |
| 83 | Bi | 41 | 0 | 41 | 97 | 56 |
| 84 | Po | 42 | 0 | 42 | 100 | 58 |
| 85 | At | 39 | 0 | 39 | 93 | 54 |
| 86 | Rn | 39 | 0 | 39 | 93 | 54 |
| 87 | Fr | 34 | 0 | 34 | 81 | 47 |
| 88 | Ra | 34 | 0 | 34 | 81 | 47 |
| 89 | Ac | 33 | 0 | 33 | 78 | 45 |
| 90 | Th | 31 | 1 | 30 | 74 | 43 |
| 91 | Pa | 29 | 0 | 29 | 69 | 40 |
| 92 | U | 28 | 0 | 28 | 66 | 38 |
| 93 | Np | 20 | 0 | 20 | 47 | 27 |
| 94 | Pu | 20 | 0 | 20 | 47 | 27 |
| 95 | Am | 17 | 0 | 17 | 40 | 23 |
| 96 | Cm | 19 | 0 | 19 | 45 | 26 |
| 97 | Bk | 21 | 0 | 21 | 50 | 29 |
| 98 | Cf | 20 | 0 | 20 | 47 | 27 |
| 99 | Es | 18 | 0 | 18 | 43 | 25 |
| 100 | Fm | 19 | 0 | 19 | 45 | 26 |
| 101 | Md | 16 | 0 | 16 | 38 | 22 |
| 102 | No | 13 | 0 | 13 | 31 | 18 |
| 103 | Lr | 16 | 0 | 16 | 38 | 22 |
| 104 | Rf | 18 | 0 | 18 | 43 | 25 |
| 105 | Db | 16 | 0 | 16 | 38 | 22 |
| 106 | Sg | 14 | 0 | 14 | 33 | 19 |
| 107 | Bh | 15 | 0 | 15 | 36 | 21 |
| 108 | Hs | 15 | 0 | 15 | 36 | 21 |
| 109 | Mt | 13 | 0 | 13 | 31 | 18 |
| 110 | Ds | 15 | 0 | 15 | 36 | 21 |
| 111 | Rg | 11 | 0 | 11 | 26 | 15 |
| 112 | Cn | 9 | 0 | 9 | 21 | 12 |
| 113 | Nh | 9 | 0 | 9 | 21 | 12 |
| 114 | Fl | 6 | 0 | 6 | 14 | 8 |
| 115 | Mc | 4 | 0 | 4 | 9 | 5 |
| 116 | Lv | 4 | 0 | 4 | 9 | 5 |
| 117 | Ts | 2 | 0 | 2 | 5 | 3 |
| 118 | Og | 1 | 0 | 1 | 2 | 1 |
---
*Method:* Predictions are scaled per element so that the global sum matches **7,759 predicted isotopes**. Source reference: Neufcourt et al., 2020.
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