• The spontaneous emssion of radiation from the nucleus of the atom

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Isotopes

Radioactive

Decay

Atom

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• The atom is a basic unit of matter consisting of a dense, central nucleus surrounded by a cloud of negativly charged electrons
• Inside the nucleus are  the protons and neutrons
• Protons are positvly charged and neutron have a neutral charge

 J.J. Thomson

• J.J. Thomson was the first to discover the electron and developed his raisin bun mode

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Rutherford                                     

• Rutherford dicovered that an atom has a nucleus but is mostly empty space, with this information he came up with this model

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