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Rutherford, who found that it consists of high-speed electrons......electron,elementary particle carrying a unit charge of negative electricity.
They move at the speed of light and have a very short wavelength (or high frequency); thus they are a type of electromagnetic radiation (see gamma radiationgamma radiation,high-energy photons emitted as one of the three types of radiation resulting from natural radioactivity.actinide series,a series of radioactive metallic elements in Group 3 of the periodic table.Members of the series are often called actinides, although actinium (at. 89) is not always considered a member of the series......One half-life is the time required for one half of any given quantity of the substance to decay......, which is the time required for one half of a given quantity of the substance to decay.
The radiation produced during radioactivity is predominantly of three types, designated as alpha, beta, and gamma rays.