AnswersFL-2002110-MJ Comprehensive Science 3 Advanced A - FlexAtomic Theory

Atomic Theory Answers

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The atomic models after Dalton’s time included ideas about the atomic structure.Which atomic model that shows the atomic structure is missing from this set?

Question illustration
A
Niels Bohr’s model
B
Schrödinger’s model
C
Rutherford’s model
D
Thomson’s model
2
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Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.

Question illustration
A
A few of the positive particles aimed at a gold foil seemed to bounce back.
B
The colors of light emitted from heated atoms had very specific energies.
C
Equations were used to identify regions around the nucleus where electrons would likely be.
D
Cathode rays were bent in the same way whenever a magnet was brought near them.
3

Which scientist developed the first model of the atom that proposed the structure of the inside of an atom?

A
Dalton
B
Bohr
C
Rutherford
D
Thomson
4

Which statement describes one feature of Rutherford’s model of the atom?

A
The atom is mostly empty space.
B
The atom cannot be divided into smaller particles.
C
Electron clouds are regions where electrons are likely to be found.
D
The electrons are located within the positive material of the nucleus.
5

What did Bohr’s model of the atom include that Rutherford’s model did not have?

A
a nucleus
B
energy levels
C
electron clouds
D
smaller particles
6

Rutherford tracked the motion of tiny, positively charged particles shot through a thin sheet of gold foil. Some particles traveled in a straight line and some were deflected at different angles.Which statement best describes what Rutherford concluded from the motion of the particles?

A
Some particles traveled through empty parts of the atoms and some particles were deflected by neutrons.
B
Some particles traveled through empty parts of the atom and some particles were deflected by electrons.
C
Some particles traveled through empty parts of the atom and some particles were deflected by the orbits of atoms.
D
Some particles traveled through empty parts of the atom and some particles were deflected by small areas of high-density positive charge in atoms.
7

The plum pudding model of the atom states that

A
each atom has an overall negative charge.
B
each atom has a dense, positively charged center.
C
an atom is a solid, indivisible sphere that makes up all matter.
D
an atom is made up of electrons in a sea of positive charges.
8

Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below.

Question illustration
A
A few of the positive particles aimed at a gold foil seemed to bounce back.
B
The colors of light emitted from heated atoms had very specific energies.
C
Experiments with water vapor showed that elements combine in specific proportions.
D
Cathode rays were bent in the same way whenever a magnet was brought near them.
9

Why did Thomson’s results from experimenting with cathode rays cause a big change in scientific thought about atoms?

A
His results gave people a picture of what atoms look like for the first time.
B
His results gave the first clues that atoms could be created and destroyed.
C
His results gave the first experimental evidence that matter is made up of atoms.
D
His results gave the first evidence that atoms were made up of smaller particles.
10

The modern model of the atom describes electrons in a little less specific detail than earlier models did. Why is it that being less sure about the placement of electrons in an atom is actually an improvement over earlier models?

A
Electrons do not follow specific paths, so describing the area where an electron is likely to be is more scientifically accurate.
B
Electrons were thought to be negatively charged, but now scientists know that their charge depends on their energy level.
C
The modern model is based on mathematical equations, so the results become less clear when the decimals are rounded.
D
The position of electrons in atomic models has changed so much that it is better to have a less specific model than to be wrong again.

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