radioactivity - Spontaneous decomposition, alpha - Helium nucleus, beta - Cannot penetrate aluminium, gamma - HIgher energy to lower energy decay, electron capture - Proton transformed to neutron, positron - same mass but opposite charge, four - number of decay series , thorium - 4n, neptunium - 4n+1, uranium - 4n+2, actinium - 4n+3,

Radioactivity Exercise

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