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The Historical Development of Atomic Theory Answers

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Whose work directly resulted in the development of an atomic model that has negative electrons stuck within a sea of positive material?

A
Democritus
B
Rutherford
C
Thomson
D
Dalton
2
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Which statement best summarizes the importance of Ernest Rutherford’s gold foil experiment?

A
It proved that all of John Dalton’s postulates were true.
B
It verified J. J. Thomson’s work on the atomic structure.
C
It showed that an electron circles a nucleus in a fixed-energy orbit.
D
It showed that a nucleus occupies a small part of the whole atom.
3

Which atomic model was proposed as a result of J. J. Thomson’s work?

A
the plum pudding model
B
the indivisible atom model
C
an atom that had a lot of empty space
D
an atom that had a concentrated nucleus
4

Which conclusion could be made from Ernest Rutherford’s gold foil experiment?

A
Atoms are made up of mostly empty space.
B
Atoms are mainly solid and block alpha particles.
C
The volume of the nucleus is large compared to the rest of the atom.
D
The mass of the nucleus is small compared to the rest of the atom.
5

Which statement best describes John Dalton’s use of creativity in his work?

A
He reinterpreted and retested Joseph Proust’s results.
B
He used a philosophy to conduct his experiment.
C
He recorded his results as four parts of the atomic theory.
D
He rejected Democritus’s idea that matter was composed of atoms.
6

From his experiments, J. J. Thomson concluded that

A
cathode ray particles can move at very fast speeds.
B
cathode ray particles can be moved by electric current.
C
atoms contain small positively charged particles that are called protons.
D
atoms contain small negatively charged particles that are called electrons.
7

What could J. J. Thomson conclude from his experiments?

A
Atoms are mostly empty space.
B
Most of the mass of the atom is concentrated in the center.
C
Atoms must balance positive and negative particles.
D
Atoms are indivisible.
8

Which scientist is credited with developing the first scientific atomic theory?

A
John Dalton
B
Joseph Proust
C
Ernest Rutherford
D
J. J. Thomson
9

Which particle is J. J. Thomson credited with discovering?

A
electron
B
neutron
C
proton
D
photon
10

What did Ernest Rutherford’s gold foil experiment demonstrate about atoms?

A
Their positive charge is located in a small region that is called the nucleus.
B
Their negative charge is located in small particles that are called electrons.
C
Their nucleus makes up the majority of the volume of the atom.
D
Their electrons are floating in a sea of positive charges.

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