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Alpha particle

Schematic diagram of the alpha particle, composed of two protons (red) and two neutrons (yellow).

Schematic diagram of the alpha particle, composed of two protons (red) and two neutrons (yellow).

The nucleus of a helium atom consisting of two protons and two neutrons. It is a part of alpha radiation. Alpha particles are released from the nuclei of atoms in a variety of nuclear reactions or during radioactive decay.

Schematic diagram of the alpha particle, composed of two protons (red) and two neutrons (yellow).

Schematic diagram of the alpha particle, composed of two protons (red) and two neutrons (yellow).