E. Goldstein reported the presence of _________ inside the atom.


proton

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E. Rutherford used ____________ particles in his scattering experiments.


alpha

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Fill in the  blanks:

E. Rutherford used ................ particles in his scattering experiments.

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Substances having similar chemical properties, but different physical properties are called _________.


Isotopes

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Isotopes contain the same number of ___________ but different number of _________.


protons, neutrons

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The negative particle discovered by J.J. Thomson was given the name ________.


electron

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