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Did an experiment with alpha particles and a gold leaf

Discovered the neutron

Discovered the electron.

Described an atom as a 'billard ball'

Explained that the electron orbited the nucleus.

Three people that proposed that an atom has a nucleus

Method used to seperate insoluble substances from a mixture

Contains only one element or compound

Relative mass of 1 and a charge of 1

Relative mass of 1 and no charge