Unit 4 Practice: Atomic History and PEN

Who was the first contributor to the atomic theory?

• John Dalton

• Ernest Rutherford

• JJ Thompson

• Democritus

• Neils Bohr

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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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

• Determined that the proton had a positive charge

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Who came up with this model of an atom?

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

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How many PROTONS would be present in the atom pictured?

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How many NEUTRONS would be present in the atom pictured?

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How many ELECTRONS would be present in the atom pictured?

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How many PROTONS would be present in the atom pictured?

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How many NEUTRONS would be present in the atom pictured?

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How many ELECTRONS would be present in the atom pictured?

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