| Nucleus | Protons | Neutrons | Shell 1 ≤2 | Shell 2 ≤8 | Shell 3 ≤18 | Shell 4 ≤32 | Shell 5 ≤50 | Shell 6 ≤72 | Natural abundance (%) | Nuclear stability |
|---|---|---|---|---|---|---|---|---|---|---|
| Hydrogen-1 | 1 | 0 | 1 | — | — | — | — | — | ||
| Hydrogen-2 | 1 | 1 | 1 | — | — | — | — | — | ||
| Helium-3 | 2 | 1 | 2 | — | — | — | — | — | ||
| Helium-4 | 2 | 2 | 2 | — | — | — | — | — | ||
| Lithium-6 | 3 | 3 | 2 | 1 | — | — | — | — | ||
| Lithium-7 | 3 | 4 | 2 | 1 | — | — | — | — | ||
| Beryllium-9 | 4 | 5 | 2 | 2 | — | — | — | — | ||
| Boron-10 | 5 | 5 | 2 | 3 | — | — | — | — | ||
| Boron-11 | 5 | 6 | 2 | 3 | — | — | — | — | ||
| Carbon-12 | 6 | 6 | 2 | 4 | — | — | — | — | ||
| Carbon-13 | 6 | 7 | 2 | 4 | — | — | — | — | ||
| Nitrogen-14 | 7 | 7 | 2 | 5 | — | — | — | — | ||
| Nitrogen-15 | 7 | 8 | 2 | 5 | — | — | — | — | ||
| Oxygen-16 | 8 | 8 | 2 | 6 | — | — | — | — | ||
| Oxygen-17 | 8 | 9 | 2 | 6 | — | — | — | — | ||
| Oxygen-18 | 8 | 10 | 2 | 6 | — | — | — | — | ||
| Neon-20 | 10 | 10 | 2 | 8 | — | — | — | — | ||
| Magnesium-24 | 12 | 12 | 2 | 8 | 2 | — | — | — | ||
| Silicon-28 | 14 | 14 | 2 | 8 | 4 | — | — | — | ||
| Sulfur-32 | 16 | 16 | 2 | 8 | 6 | — | — | — | ||
| Argon-40 | 18 | 22 | 2 | 8 | 8 | — | — | — | ||
| Calcium-40 | 20 | 20 | 2 | 8 | 8 | 2 | — | — | ||
| Calcium-46 | 20 | 26 | 2 | 8 | 8 | 2 | — | — | ||
| Iron-54 | 26 | 28 | 2 | 8 | 14 | 2 | — | — | ||
| Iron-56 | 26 | 30 | 2 | 8 | 14 | 2 | — | — | ||
| Iron-58 | 26 | 32 | 2 | 8 | 14 | 2 | — | — | ||
| Nickel-62 | 28 | 34 | 2 | 8 | 16 | 2 | — | — | ||
| Zirconium-90 | 40 | 50 | 2 | 8 | 18 | 10 | 2 | — | ||
| Tin-112 | 50 | 62 | 2 | 8 | 18 | 18 | 4 | — | ||
| Tin-120 | 50 | 70 | 2 | 8 | 18 | 18 | 4 | — | ||
| Tin-124 | 50 | 74 | 2 | 8 | 18 | 18 | 4 | — | ||
| Xenon-132 | 54 | 78 | 2 | 8 | 18 | 18 | 8 | — | ||
| Barium-138 | 56 | 82 | 2 | 8 | 18 | 18 | 8 | 2 | ||
| Gold-197 | 79 | 118 | 2 | 8 | 18 | 32 | 18 | 1 | ||
| Mercury-204 | 80 | 124 | 2 | 8 | 18 | 32 | 18 | 2 | ||
| Lead-204 | 82 | 122 | 2 | 8 | 18 | 32 | 18 | 4 | ||
| Lead-206 | 82 | 124 | 2 | 8 | 18 | 32 | 18 | 4 | ||
| Lead-207 | 82 | 125 | 2 | 8 | 18 | 32 | 18 | 4 | ||
| Lead-208 | 82 | 126 | 2 | 8 | 18 | 32 | 18 | 4 | ||
| Fluorine-19 | 9 | 10 | 2 | 7 | — | — | — | — | ||
| Sodium-23 | 11 | 12 | 2 | 8 | 1 | — | — | — | ||
| Aluminium-27 | 13 | 14 | 2 | 8 | 3 | — | — | — | ||
| Phosphorus-31 | 15 | 16 | 2 | 8 | 5 | — | — | — | ||
| Chlorine-35 | 17 | 18 | 2 | 8 | 7 | — | — | — | ||
| Potassium-39 | 19 | 20 | 2 | 8 | 8 | 1 | — | — | ||
| Scandium-45 | 21 | 24 | 2 | 8 | 9 | 2 | — | — | ||
| Titanium-48 | 22 | 26 | 2 | 8 | 10 | 2 | — | — | ||
| Vanadium-51 | 23 | 28 | 2 | 8 | 11 | 2 | — | — | ||
| Chromium-52 | 24 | 28 | 2 | 8 | 13 | 1 | — | — | ||
| Manganese-55 | 25 | 30 | 2 | 8 | 13 | 2 | — | — | ||
| Cobalt-59 | 27 | 32 | 2 | 8 | 15 | 2 | — | — | ||
| Copper-63 | 29 | 34 | 2 | 8 | 18 | 1 | — | — | ||
| Zinc-64 | 30 | 34 | 2 | 8 | 18 | 2 | — | — | ||
| Gallium-69 | 31 | 38 | 2 | 8 | 18 | 3 | — | — | ||
| Germanium-74 | 32 | 42 | 2 | 8 | 18 | 4 | — | — | ||
| Arsenic-75 | 33 | 42 | 2 | 8 | 18 | 5 | — | — | ||
| Selenium-80 | 34 | 46 | 2 | 8 | 18 | 6 | — | — | ||
| Bromine-79 | 35 | 44 | 2 | 8 | 18 | 7 | — | — | ||
| Krypton-84 | 36 | 48 | 2 | 8 | 18 | 8 | — | — | ||
| Rubidium-85 | 37 | 48 | 2 | 8 | 18 | 8 | 1 | — | ||
| Strontium-88 | 38 | 50 | 2 | 8 | 18 | 8 | 2 | — | ||
| Yttrium-89 | 39 | 50 | 2 | 8 | 18 | 9 | 2 | — | ||
| Niobium-93 | 41 | 52 | 2 | 8 | 18 | 12 | 1 | — | ||
| Molybdenum-98 | 42 | 56 | 2 | 8 | 18 | 13 | 1 | — | ||
| Ruthenium-102 | 44 | 58 | 2 | 8 | 18 | 15 | 1 | — | ||
| Rhodium-103 | 45 | 58 | 2 | 8 | 18 | 16 | 1 | — | ||
| Palladium-106 | 46 | 60 | 2 | 8 | 18 | 18 | — | — | ||
| Silver-107 | 47 | 60 | 2 | 8 | 18 | 18 | 1 | — | ||
| Cadmium-114 | 48 | 66 | 2 | 8 | 18 | 18 | 2 | — | ||
| Indium-113 | 49 | 64 | 2 | 8 | 18 | 18 | 3 | — | ||
| Antimony-121 | 51 | 70 | 2 | 8 | 18 | 18 | 5 | — | ||
| Tellurium-126 | 52 | 74 | 2 | 8 | 18 | 18 | 6 | — | ||
| Iodine-127 | 53 | 74 | 2 | 8 | 18 | 18 | 7 | — | ||
| Caesium-133 | 55 | 78 | 2 | 8 | 18 | 18 | 8 | 1 | ||
| Lanthanum-139 | 57 | 82 | 2 | 8 | 18 | 18 | 9 | 2 | ||
| Cerium-140 | 58 | 82 | 2 | 8 | 18 | 19 | 9 | 2 | ||
| Praseodymium-141 | 59 | 82 | 2 | 8 | 18 | 21 | 8 | 2 | ||
| Neodymium-142 | 60 | 82 | 2 | 8 | 18 | 22 | 8 | 2 | ||
| Samarium-152 | 62 | 90 | 2 | 8 | 18 | 24 | 8 | 2 | ||
| Europium-153 | 63 | 90 | 2 | 8 | 18 | 25 | 8 | 2 | ||
| Gadolinium-158 | 64 | 94 | 2 | 8 | 18 | 25 | 9 | 2 | ||
| Terbium-159 | 65 | 94 | 2 | 8 | 18 | 27 | 8 | 2 | ||
| Dysprosium-164 | 66 | 98 | 2 | 8 | 18 | 28 | 8 | 2 | ||
| Holmium-165 | 67 | 98 | 2 | 8 | 18 | 29 | 8 | 2 | ||
| Erbium-166 | 68 | 98 | 2 | 8 | 18 | 30 | 8 | 2 | ||
| Thulium-169 | 69 | 100 | 2 | 8 | 18 | 31 | 8 | 2 | ||
| Ytterbium-174 | 70 | 104 | 2 | 8 | 18 | 32 | 8 | 2 | ||
| Lutetium-175 | 71 | 104 | 2 | 8 | 18 | 32 | 9 | 2 | ||
| Hafnium-180 | 72 | 108 | 2 | 8 | 18 | 32 | 10 | 2 | ||
| Tantalum-181 | 73 | 108 | 2 | 8 | 18 | 32 | 11 | 2 | ||
| Tungsten-184 | 74 | 110 | 2 | 8 | 18 | 32 | 12 | 2 | ||
| Rhenium-185 | 75 | 110 | 2 | 8 | 18 | 32 | 13 | 2 | ||
| Osmium-192 | 76 | 116 | 2 | 8 | 18 | 32 | 14 | 2 | ||
| Iridium-193 | 77 | 116 | 2 | 8 | 18 | 32 | 15 | 2 | ||
| Platinum-195 | 78 | 117 | 2 | 8 | 18 | 32 | 17 | 1 | ||
| Thallium-205 | 81 | 124 | 2 | 8 | 18 | 32 | 18 | 3 |
No matching isotopes.
Abundance is the percentage of an element’s atoms that are this isotope, not its share of all matter. Values are representative natural isotopic compositions from NIST (uncertainties omitted), not universal constants: samples can differ, particularly hydrogen, helium, lithium, boron and lead. Only selected isotopes are listed, so an element’s rows need not total 100%.
Stability follows IAEA LiveChart / ENSDF. “Stable” means no radioactive decay is observed; it does not rule out theoretically possible, extremely slow decay. Lead-204 has a reported half-life lower limit (≥), not a measured decay lifetime. y = years. These reference values are independent of the geometric model.