History of Atomic theory

True or False? John Dalton believed that moving electrons exist in electron clouds around the nucleus. 

• False
• True 

What was the name of J.J Thomsons' model of atomic structure. 

• Electron Cloud Model 
• Electron Sea Model
• Plum Pudding Model 
• Bohr Model

Who proposed the idea that electrons are not fixed but constantly move?

• Dalton
• Bohr
• Schrodinger
• Chadwick

What does the Bohr model suggest?

• Atoms are small, hard, indivisible objects. 
• That protons in the nucleus are attracted to electrons in the electron clouds. 
• That electrons travel around the nucleus of an atom in orbits or definite paths.

Was John Daltons theory earlier than Niels Bohr?

• No
• Yes

Who proposed that the atom consists mostly of empty space?

• Bohr
• Dalton
• Rutherford
• Chadwick

Which model suggested that: Atoms mostly consist of positively charged material with negatively charged particles (electrons) located throughout the positive material.

• Bohrs Model
• Plum Pudding Model 
• Democritus Model
• Our current model 

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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 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

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