Atomic History- Scientist

What were John Dalton three contributions to atomic history?

• Created the atomic theory

• Discovered that the atom is mostly empty space

• Believed that atoms of a given element are identical

• Hypothesized that the atom is a tiny, hard sphere

• Believed that the universe was made of tiny "uncuttable" particles

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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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What are two facts about Democritus's?

• Greek philosopher

• Created the atomic theory

• Used the cathode ray tube in his discovery

• Believed that the universe was made of tiny "uncuttable" particles

• Discovered that the atom is mostly empty space

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NGSS.MS-PS1-1

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

Which model of the atom proposed that atoms were positive spheres with negative electrons in them?

• Heliocentric Model
• Solid Sphere Model
• Plum Pudding Model
• Planetary Model

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NGSS.MS-PS1-1

Which scientist saw the atom as a solid sphere?

• Dalton
• Thomson
• Rutherford
• Bohr

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Who's model is this?

• Thomson
• Rutherford
• Democritus
• Bohr

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NGSS.MS-PS1-1

Who came up with this model?

• Dalton
• Thomson
• Rutherford
• Bohr

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NGSS.MS-PS1-1

Discovered particles in the nucleus of atoms, neutrons

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

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In Dalton's Atomic Theory, all elements consist of __________ that cannot be divided.

• Atoms
• Parts
• Molecules
• Hydrogen

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