The Development of Atomic Theory

Which scientist saw the atom as a positively charged sphere with negative particles (electrons) embedded within?

• J.J. Thomson

• Niels Bohr

• John Dalton

• Ernest Rutherford

Which scientist proposed a model of the atom in which the electrons are orbiting at different levels?

• Niels Bohr

• James Chadwick

• John Dalton

• Ernest Rutherford

Place the following scientists in order, from earliest to latest: 
Ernest Rutherford
J.J. Thomson
John Dalton

• J.J. Thomson, John Dalton, Ernest Rutherford

• John Dalton, Ernest Rutherford

• Ernest Rutherford, John Dalton

• John Dalton, J.J. Thomson

This contains most of the mass of an atom

• Electron Cloud

• Nucleus

• Electron

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This particle is found in the nucleus and has no charge

• Neutron

• Proton

• Electron

Tags

NGSS.HS-PS1-8

This is a negatively charged particle found outside the nucleus

• Electron

• Proton

• Neutron

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Determined that most of the atom is empty.

• J,J Thomson

• Democritus

• Rutherford

• Dalton

• Niels Bohr

Worked extensively with cathode ray tubes decipher the structure of the atom

• J.J Thomson

• Democritus

• Rutherford

• Dalton

• Niels Bohr

Coined the word "atom"

• John Dalton

• Democritus

• J.J Thomson

• Niels Bohr

• Rutherford

As an atom is neutral, the number positive charges in the nucleus (the number of protons) must be the same as that electrons.

• Modern atom

• J.J Thomson

• John Dalton

• Niels Bohr

• Rutherford

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