Alpha particle symbol (⁴₂He)

An example figure from the Nuclide Notation generator.

The symbol for an alpha particle: He with mass number 4 at the top left and 2 at the bottom left — An alpha particle written as in a nuclear decay equation: the symbol He with a mass number of 4 at the top left and an atomic number of 2 at the bottom left, since an alpha particle is a helium-4 nucleus of 2 protons and 2 neutrons.

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Answer key

Alpha particle, a helium-4 nucleus
Mass number 4, atomic number (charge) 2

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