Atomic History

Believed that electrons traveled around the nucleus in definite paths.

• Niels Bohr
• John Dalton
• Modern Atomic Theory
• Ernest Rutherford

Discovered that the atom has a small, dense, positively charged nucleus.

• Ernest Rutherford
• Heisenberg
• Democritus
• JJ Thomson

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The following picture represents which atomic model?

• JJ Thomson
• John Dalton
• Ernest Rutherford
• Schrodinger & Heisenberg

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What were J. J. Thomson's three contributions to the atomic theory?

• Discovered the electron

• Discovered the nucleus -did the gold foil experiment

• Used the cathode ray tube in his discovery

• Created a model of the atom with electrons moving around the nucleus in fixed orbits

• Created the "plum pudding" model of the atom

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NGSS.MS-PS1-1

What is Neils Bohr's contribution to the atomic theory?

• Created the atomic theory

• Created a model of the atom with electrons moving around the nucleus in a fixed orbits

• Discovered that the proton had a positive charge

• Believed that atoms of a given element are identical

• Discovered the electron

What were Ernest Rutherford's three contributions to atomic theory?

• Discovered that the atom is mostly empty space

• Discovered the nucleus- did the gold foil experiment

• Used the cathode ray tube in his discovery

• Discovered the electron

• Discovered that the proton had a positive charge

Who came up with this model of an atom?

• J.J. Thompson
• Ernest Rutherford
• Neils Bohr
• James Chadwick

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NGSS.MS-PS1-1

Who came up with this model?

• Dalton
• Thomson
• Rutherford
• Bohr

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Rutherford’s experiment determined that the nucleus of an atom is tiny, dense and  ______ charged. 

• neutrally
• negatively
• positively

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NGSS.HS-PS1-8

Mass is neither created nor destroyed during chemical reactions or physical changes.

• Law of multiple proportions

• law of definite proportions

• law of scientific theory

• law of conservation of mass

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