History of Atomic Theory

Which ancient Greek philosopher was the first to propose that matter is made up of tiny individual particles called atoms?

• Proust

• Democritus

• Dalton

• Aristotle

The law of _____ states that mass is neither created nor destroyed during chemical reactions or physical changes.

• multiple proportions

• definite proportions

• universal gravitation

• conservation of mass

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NGSS.MS-PS1-5

Which of the following is NOT a part of Dalton's atomic theory?

• Atoms cannot be divided, created or destroyed.

• The number of protons in an atom is its atomic number.

• In chemical reactions, atoms are combined, separated or rearranged.

• All matter is composed of extremely small particles called atoms.

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the correct order of scientists in order of their work related to the atomic theory from earliest to most recent?

• Neils Bohr, Ernest Rutherford, JJ Thomson, John Dalton, & Democritus

• JJ Thomson, John Dalton, Neils Bohr, Ernest Rutherford, & Democritus

• Democritus, John Dalton, JJ Thomson, Ernest Rutherford, and Neils Bohr

• John Dalton, Neils Bohr, JJ Thomson, Democritus, & Ernest Rutherford

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NGSS.MS-PS1-1

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

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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NGSS.MS-PS1-1

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

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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Who proposed that the atom consists mostly of empty space?

• Bohr
• Dalton
• Rutherford
• Chadwick