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Actinium-225

Americum-241

Carbon-14

Cobalt-60

Plutonium-239

Polonium-210

Radium-226

Strontium-90

Thallium-204

Uranium-235

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radioisotopes

The number after an isotope’s name shows how many particles (protons and neutrons) there are in its nucleus. Uranium-235 has 92 protons and 143 neutrons in its nucleus. Uranium-238 has three morę neutrons.

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