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8 Cards in this Set

  • Front
  • Back

Charge of an atom

No overall charge.

Mass of a proton, neutron and electron

Proton: 1


Neutron: 1


Electron: very small

Size of an atom

Radius: 0.1nm (1×10•-10)

Niels Bohr

Adapted the atomic model suggesting a positively charged nucleus surrounded by orbiting electrons.

James Chadwick

Evidence to show existence of neutrons in nucleus.

Nucleus development

Experiments show nucleus is made of smaller charged particles.

Alpha particle scattering

The mass of an atom concentrated in centre, charged too.

Relative atomic mass

(mass × abundance) + (mass × abundance)


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