Alpha Particles: Helium nuclei which are big, heavy and slow moving. They consequently are stopped quickly. They are strongly ionising .
Alpha Particles contain; 2 protons and 2 neutrons. Mass of 4 (top), charge 2(bottom).
When an unstable nucleus emitts an alpha particle, the atomic number(bottom) goes down by 2 and the mass number goes down by 4 (top)
Beta Particles: Electrons. Quite fast and small. Penetrate moderately and ionise moderatley.
Emitted by a nucleus which has too many neutrons compared to protons. A neutron changes into a proton and a beta particle.
When this happens, its atomic number increases by 1 and its mass number stays the same.
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