To calculate the total count of isotopes for all elements, I’ll need to go back and count the isotopes listed for each element from my previous responses. I’ll summarize the total for each batch of 10 elements.


Total Isotope Count by Element Batch

  • Elements 1-10 (Hydrogen to Neon): 62 isotopes
    • Hydrogen: 7
    • Helium: 8
    • Lithium: 9
    • Beryllium: 12
    • Boron: 12
    • Carbon: 15
    • Nitrogen: 15
    • Oxygen: 16
    • Fluorine: 16
    • Neon: 17
  • Elements 11-20 (Sodium to Calcium): 91 isotopes
    • Sodium: 20
    • Magnesium: 17
    • Aluminum: 20
    • Silicon: 21
    • Phosphorus: 19
    • Sulfur: 16
    • Chlorine: 22
    • Argon: 20
    • Potassium: 20
    • Calcium: 22
  • Elements 21-30 (Scandium to Zinc): 93 isotopes
    • Scandium: 18
    • Titanium: 18
    • Vanadium: 18
    • Chromium: 19
    • Manganese: 19
    • Iron: 20
    • Cobalt: 19
    • Nickel: 29
    • Copper: 28
    • Zinc: 33
  • Elements 31-40 (Gallium to Zirconium): 117 isotopes
    • Gallium: 24
    • Germanium: 24
    • Arsenic: 27
    • Selenium: 25
    • Bromine: 25
    • Krypton: 23
    • Rubidium: 27
    • Strontium: 26
    • Yttrium: 29
    • Zirconium: 26
  • Elements 41-50 (Niobium to Tin): 118 isotopes
    • Niobium: 24
    • Molybdenum: 21
    • Technetium: 28
    • Ruthenium: 25
    • Rhodium: 23
    • Palladium: 25
    • Silver: 20
    • Cadmium: 26
    • Indium: 28
    • Tin: 38
  • Elements 51-60 (Antimony to Neodymium): 113 isotopes
    • Antimony: 22
    • Tellurium: 22
    • Iodine: 25
    • Xenon: 28
    • Cesium: 27
    • Barium: 26
    • Lanthanum: 23
    • Cerium: 22
    • Praseodymium: 19
    • Neodymium: 22
  • Elements 61-70 (Promethium to Ytterbium): 115 isotopes
    • Promethium: 20
    • Samarium: 19
    • Europium: 21
    • Gadolinium: 21
    • Terbium: 19
    • Dysprosium: 21
    • Holmium: 20
    • Erbium: 20
    • Thulium: 21
    • Ytterbium: 22
  • Elements 71-80 (Lutetium to Mercury): 139 isotopes
    • Lutetium: 25
    • Hafnium: 24
    • Tantalum: 26
    • Tungsten: 23
    • Rhenium: 25
    • Osmium: 24
    • Iridium: 28
    • Platinum: 29
    • Gold: 26
    • Mercury: 29
  • Elements 81-90 (Thallium to Thorium): 122 isotopes
    • Thallium: 20
    • Lead: 24
    • Bismuth: 21
    • Polonium: 22
    • Astatine: 21
    • Radon: 21
    • Francium: 25
    • Radium: 24
    • Actinium: 24
    • Thorium: 28
  • Elements 91-100 (Protactinium to Fermium): 105 isotopes
    • Protactinium: 20
    • Uranium: 20
    • Neptunium: 17
    • Plutonium: 17
    • Americium: 15
    • Curium: 16
    • Berkelium: 15
    • Californium: 15
    • Einsteinium: 15
    • Fermium: 18
  • Elements 101-110 (Mendelevium to Darmstadtium): 76 isotopes
    • Mendelevium: 17
    • Nobelium: 12
    • Lawrencium: 10
    • Rutherfordium: 11
    • Dubnium: 11
    • Seaborgium: 10
    • Bohrium: 9
    • Hassium: 8
    • Meitnerium: 6
    • Darmstadtium: 12
  • Elements 111-118 (Roentgenium to Oganesson): 28 isotopes
    • Roentgenium: 6
    • Copernicium: 7
    • Nihonium: 6
    • Flerovium: 8
    • Moscovium: 6
    • Livermorium: 4
    • Tennessine: 1
    • Oganesson: 1

The total count of all isotopes for all 118 elements is 965. This number includes both stable and unstable (radioactive) isotopes.