Isotope

Nuclear Energy

Atoms of an element with different neutron numbers.

Isotopes share atomic number (protons) but differ in neutron number. Uranium-235 and uranium-238 are important nuclear-fuel isotopes.

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Radioactivity is a natural phenomenon. Unstable atom nuclei release particles: helium nuclei (alpha); electrons or positrons (beta); photons (gamma).

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Heavy element used as nuclear fuel.