Alpha - Two protons, two neutrons, Beta - High-speed electron, Gamma - An electromagnetic wave, Ionising - Can knock electrons off other atoms, Helium - The nucleus of this element is the same as an alpha particle., Emitted - To give off, discharge or release, Unstable - Unsteady, likely to break., Range - The difference between two numbers, Nucleus - The part of an atom that contains protons and neutrons, Electrons - These orbit the nucleus of an atom,

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