Question 1

What is the speed at which a neutron is travelling if it has a wavelength of 10.0 pm?Hint: You are calculating the speed of the particle for this question, not using the speed of light.

Accepted Answer

A)  1.08 × 103 m/s
B)  3.96 × 104 m/s
C)  4.48 × 105 m/s
D)  4.05 × 106 m/s
E)  2.77 × 102 m/s

Question 2

Which statement is true?

Accepted Answer

A)  The line spectra of atoms consist of a series of white lines superimposed on a colorful background.
B)  The line spectra of atoms consist of a series of white lines superimposed on a dark background.
C)  The line spectra of atoms consist of a series of colorful lines superimposed on a dark background.
D)  The line spectra of atoms consist of a series of dark lines superimposed on a white background.
E)  The line spectra of atoms consist of a series of dark lines superimposed on a colorful background.

Question 3

When an atom absorbs energy it moves from its ground state to its ________.

Accepted Answer

The answer of When an atom absorbs energy it moves...

Question 4

A correct description for the electron configuration of a vanadium atom is

Accepted Answer

A)  [Ar] 4s1 3d4, paramagnetic.
B)  [Ar] 4s2 3d3, paramagnetic.
C)  [Ar] 4s3 3d2, paramagnetic.
D)  [Ar] 4d5, paramagnetic.
E)  [Ar] 3s2 3d3, paramagnetic.

Question 5

Which of the following are expected to be paramagnetic in their ground state electron configurations: S, Ne, Cd, Si, Cl? Hint: Look for unpaired electrons.

Accepted Answer

A)  S, Ne, and Cl
B)  Cd, Ne, and Cl
C)  Cd, Ne, and Si
D)  S, Si, and Cl
E)  All are paramagnetic.

Question 6

Based on the aufbau principle and other applicable guiding principles, what electron configuration would one reasonably expect to find for technetium (Z = 43) ?

Accepted Answer

A)  [Kr] 4s2 3d5
B)  [Kr] 4s2 4d5
C)  [Kr] 4d7
D)  [Kr] 5s2 4d5
E)  [Kr] 5s2 5d5

Question 7

The very narrow band of wavelengths ranging from about 400 to 700 nm is called the ________.

Accepted Answer

The answer of The very narrow band of wavelengths ranging...

Question 8

Which statement about a hydrogen atom is false?

Accepted Answer

A)  Atoms undergo the same specific energy changes.
B)  When an excited atom loses energy, only a specific amount can be lost.
C)  When an atom is supplied with energy, an electron drops from a higher energy level to a lower energy level.
D)  When an electron drops back to a lower energy level, energy equal to the difference between the two levels is released and emitted as a photon.
E)  The statements above are all true.

Question 9

Which of the following choices is the correct electron configuration for a vanadium atom?

Accepted Answer

The answer of Which of the following choices is the...

Question 10

Which atom has the smallest radius?

Accepted Answer

A)  Rb
B)  Na
C)  Al
D)  Ne
E)  O

Question 11

It is possible for three of the four quantum numbers to be the same for a pair of electrons.

Accepted Answer

A) True 
 B)False

Question 12

Calculate the energy difference between the two energy levels that are responsible for the line that has a wavelength of 285.2 nm in an emission spectrum of an atom.

Accepted Answer

A)  4.017 × 10-21 J
B)  3.043 × 10-18 J
C)  5.192 × 10-15 J
D)  7.254 × 10-18 J
E)  6.965 × 10-19 J

Question 13

The values of n for the valence shells of Sb, Ca, I, and Po are, respectively:

Accepted Answer

A)  3, 4, 5, 6
B)  5, 5, 6, 6
C)  3, 4, 3, 6
D)  5, 6, 5, 4
E)  5, 4, 5, 6

Question 14

The notation for the subshell with n = 5 and l = 3 is

Accepted Answer

A)  5d subshell.
B)  5p subshell.
C)  5f subshell.
D)  5g subshell.
E)  5s subshell.

Question 15

Atomic hydrogen has a single electron, and therefore produces the simplest emission spectrum with the fewest lines.

Accepted Answer

A) True 
 B)False

Question 16

Which atom has the smallest first ionization energy?

Accepted Answer

A)  Rb
B)  Na
C)  Al
D)  Ne
E)  O

Question 17

Given the following sets of quantum numbers for n, l, ml, and ms, which one of these sets is not possible for an electron in an atom?

Accepted Answer

Question 18

What is the frequency of radiation which has an energy of 216.1 kJ per mole of photons?Hint: Pay careful attention to your units. 1 kJ = 1000 J.

Accepted Answer

A)  615.9 × 1014 s-1
B)  1.624 × 1014 s-1
C)  1.058 × 10-10 s-1
D)  5.416 × 1014 s-1
E)  3.588 × 10-19 s-1

Question 19

Calculate the wavelength of the spectral line in the spectrum of hydrogen for which n1 = 2 and n2 = 4.Hint: Use the Rydberg equation to solve.

Accepted Answer

A)  207 nm
B)  365 nm
C)  486 nm
D)  274 nm
E)  131 nm

Question 20

Calculate the frequency of visible light having a wavelength of 464.1 nm.

Accepted Answer

A)  139.1 s-1
B)  1.548 × 10-6 s-1
C)  1.548 × 10-15 s-1
D)  6.464 × 1014 s-1
E)  6.464 × 105 s-1

Exam 8: The Quantum Mechanical Atom

What is the speed at which a neutron is travelling if it has a wavelength of 10.0 pm?Hint: You are calculating the speed of the particle for this question, not using the speed of light.

Correct AnswerverifiedShow Answer

When an atom absorbs energy it moves from its ground state to its ________.

Correct AnswerverifiedShow Answer

The notation for the subshell with n = 5 and l = 3 is

Correct AnswerverifiedShow Answer

Which of the following choices is the correct electron configuration for a vanadium atom?

Correct AnswerverifiedShow Answer

The very narrow band of wavelengths ranging from about 400 to 700 nm is called the ________.

Correct AnswerverifiedShow Answer

Which atom has the smallest first ionization energy?

Correct AnswerverifiedShow Answer

Which statement about a hydrogen atom is false?

Correct AnswerverifiedShow Answer

Based on the aufbau principle and other applicable guiding principles, what electron configuration would one reasonably expect to find for technetium (Z = 43) ?

Correct AnswerverifiedShow Answer

Calculate the wavelength of the spectral line in the spectrum of hydrogen for which n1 = 2 and n2 = 4.Hint: Use the Rydberg equation to solve.

Correct AnswerverifiedShow Answer

Which statement is true?

Correct AnswerverifiedShow Answer

Which of the following are expected to be paramagnetic in their ground state electron configurations: S, Ne, Cd, Si, Cl? Hint: Look for unpaired electrons.

Correct AnswerverifiedShow Answer

Calculate the frequency of visible light having a wavelength of 464.1 nm.

Correct AnswerverifiedShow Answer

The values of n for the valence shells of Sb, Ca, I, and Po are, respectively:

Correct AnswerverifiedShow Answer

A correct description for the electron configuration of a vanadium atom is

Correct AnswerverifiedShow Answer

What is the frequency of radiation which has an energy of 216.1 kJ per mole of photons?Hint: Pay careful attention to your units. 1 kJ = 1000 J.

Correct AnswerverifiedShow Answer

Which atom has the smallest radius?

Correct AnswerverifiedShow Answer

Atomic hydrogen has a single electron, and therefore produces the simplest emission spectrum with the fewest lines.

Correct AnswerverifiedShow Answer

It is possible for three of the four quantum numbers to be the same for a pair of electrons.

Correct AnswerverifiedShow Answer

Given the following sets of quantum numbers for n, l, ml, and ms, which one of these sets is not possible for an electron in an atom?

Correct AnswerverifiedShow Answer

Calculate the energy difference between the two energy levels that are responsible for the line that has a wavelength of 285.2 nm in an emission spectrum of an atom.

Correct AnswerverifiedShow Answer

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Calculate the wavelength of the spectral line in the spectrum of hydrogen for which n₁ = 2 and n₂ = 4.Hint: Use the Rydberg equation to solve.

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Given the following sets of quantum numbers for n, l, m_l, and m_s, which one of these sets is not possible for an electron in an atom?

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