Unit 3 Review: Atomic Theory

Who discovered that the atom had an small, dense, positively charged center?

• Ernest Rutherford

• J.J Thomson

• Robert Millikan

• John Dalton

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Who named the positive center of the atom the "nucleus?"

• Democritus

• Dalton

• Thomson

• Rutherford

Who discovered that atoms are mostly empty space?

• Dalton

• Thomson

• Rutherford

• Bohr

Who proposed that electrons move around the nucleus in circular orbits?

• Dalton

• Thomson

• Rutherford

• Bohr

Which scientist saw the atom as a solid sphere?

• Dalton
• Thomson
• Rutherford
• Bohr

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Who came up with the"solar system" model of the atom?

• J.J. Thompson

• Ernest Rutherford

• Neils Bohr

• James Chadwick

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Who's model is this?

• Thomson
• Rutherford
• Democritus
• Bohr

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Who came up with this model?

• Dalton
• Thomson
• Rutherford
• Bohr

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In the Thomson Model, he discovered the existence of what particle?

• Electrons
• Protons
• Neutrons
• Quarks

Discovered particles in the nucleus of atoms, neutrons

• Niels Bohr
• Ernest Rutherford
• J.J. Thomson
• James Chadwick

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NGSS.HS-PS1-8