AnswersSVHS Chemistry 1 FAThe Historical Development of Atomic Theory

The Modern Atomic Theory Answers

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1
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The photoelectric effect is the diffractionemissionspinning

A
diffraction
B
emission
C
spinning
2
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The energy of the emitted electrons depends on the exposurefrequencyintensity of the light.

A
exposure
B
frequency
C
intensity
3

Which are aspects covered by Bohr’s atomic model?

A
Electrons can have a measured radius.
B
Higher orbits have lower energies.
C
Electrons exist between orbits.
D
Electrons do not have energy, the energy is determined by the orbit.
4

Which statements are true of the electron cloud model? Check all that apply.

A
It is also known as the planetary model.
B
It is considered the modern atomic model.
C
It describes the probable locations of the electrons.
D
It describes the specific locations of the electrons.
5

Compare the modern (electron cloud) model of the atom with Bohr’s atomic model. Which of these statements describe the two models correctly? Check all of the boxes that apply.

A
Bohr’s model was replaced only because of its age.
B
Bohr’s model electrons cannot exist between orbits, but in the electron cloud model the location of the electrons cannot be predicted.
C
The modern model explains all available data about atoms; Bohr’s model does not.
D
The modern model is more widely accepted because it was proposed by more well known scientists.
6

The photoelectric effect is the diffraction✔ emissionspinning

A
diffraction
B
✔ emission
C
spinning
7

Which are aspects covered by Bohr’s atomic model?

A
Electrons can have a measured radius.
B
Higher orbits have lower energies.
C
Electrons exist between orbits.
D
Electrons do not have energy, the energy is determined by the orbit.
8

Describe how the Bohr model explains both of these observations.

Answer:

Electrons can occupy only certain energy levels. When an electron moves from a higher level to a lower one, it emits light at a wavelength determined by the energy difference between the levels. Each element has unique energy levels, so each has a unique emission spectrum.

9

Which statements are true of the electron cloud model? Check all that apply.

A
It is also known as the planetary model.
B
It is considered the modern atomic model.
C
It describes the probable locations of the electrons.
D
It describes the specific locations of the electrons.
10

Compare the modern (electron cloud) model of the atom with Bohr’s atomic model. Which of these statements describe the two models correctly? Check all of the boxes that apply.

A
Bohr’s model was replaced only because of its age.
B
Bohr’s model electrons cannot exist between orbits, but in the electron cloud model the location of the electrons cannot be predicted.
C
The modern model explains all available data about atoms; Bohr’s model does not.
D
The modern model is more widely accepted because it was proposed by more well known scientists.
11

The energy of the emitted electrons depends on the exposure✔ frequencyintensity of the light.

A
exposure
B
✔ frequency
C
intensity
12

Did your answer include all of the following?

A
In the Bohr model, electrons can exist only in certain energy levels surrounding the atom.
B
When electrons jump from a higher energy level to a lower one, they emit light at a wavelength that corresponds to the energy difference between the levels.
C
The energy levels in each atom are unique.

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