History of the Atomic Theory

Who was the first person to study atomic theory?

• Dalton
• Democritus
• Chadwick
• Miller

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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NGSS.MS-PS1-1

Who proposed that the atom consists mostly of empty space?

• Bohr
• Dalton
• Rutherford
• Chadwick

Was John Daltons theory earlier than Niels Bohr?

• No
• Yes

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.

What was James Chadwicks most notable discovery?

• The nucleus contains protons. 
• The nucleus contains neutrons.
• Electron are not fixed.
• Protons are positive.

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NGSS.HS-PS1-8

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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NGSS.MS-PS1-1

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

Tags

NGSS.MS-PS1-1

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

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