Question 1

The electron spin quantum number can have values of

Accepted Answer

A)  -1/2, -1, 0, +1, +1/2. 
B)  -1/2, -1, +1, +1/2. 
C)  -1/2, 0, +1/2. 
D)  -1/2, +1/2. 
E)  only +1/2. 
A)  -1/2, -1, 0, +1, +1/2. 
B)  -1/2, -1, +1, +1/2. 
C)  -1/2, 0, +1/2. 
D)  -1/2, +1/2. 
E)  only +1/2.

Question 2

The Balmer series is formed by electron transitions in hydrogen that

Accepted Answer

A)  end on the n = 1 shell. 
B)  begin on the n = 1 shell. 
C)  end on the n = 2 shell. 
D)  begin on the n = 2 shell. 
E)  are between the n = 1 and n = 3 shells. 
A)  end on the n = 1 shell. 
B)  begin on the n = 1 shell. 
C)  end on the n = 2 shell. 
D)  begin on the n = 2 shell. 
E)  are between the n = 1 and n = 3 shells.

Question 3

A hydrogen atom is excited to the n = 9 level. Its decay to the n = 6 level detected in a photographic plate. What is the frequency of the light photographed? 
(1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ∙ s)

Accepted Answer

A)  5.08 × 1013 Hz 
B)  5910 Hz 
C)  5910 nm 
D)  3.28 × 10-9 km 
A)  5.08 × 1013 Hz 
B)  5910 Hz 
C)  5910 nm 
D)  3.28 × 10-9 km

Question 4

If ℓ = 4, which one of the following is a possible quantum number for n?

Accepted Answer

A)  0 
B)  2 
C)  3 
D)  4 
E)  8 
A)  0 
B)  2 
C)  3 
D)  4 
E)  8

Question 5

How many possible sets of electron states (or quantum numbers) are there in the 5f subshell?

Accepted Answer

A)  2 
B)  8 
C)  10 
D)  14 
A)  2 
B)  8 
C)  10 
D)  14

Question 6

Which one of the following is the correct electronic configuration for carbon, which has 6 electrons?

Accepted Answer

A)  1s2 2s2 2p2 
B)  1s1 2p1 
C)  1s1 2s2 2p1 
D)  1s1 2s1 2p1 
E)  1s2 2s2 2p4 
A)  1s2 2s2 2p2 
B)  1s1 2p1 
C)  1s1 2s2 2p1 
D)  1s1 2s1 2p1 
E)  1s2 2s2 2p4

Question 7

The longest wavelength of a photon that can be emitted by a hydrogen atom, for which the initial state is n = 3, is closest to which one of the following values? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

Accepted Answer

A)  550 nm 
B)  575 nm 
C)  600 nm 
D)  625 nm 
E)  658 nm 
A)  550 nm 
B)  575 nm 
C)  600 nm 
D)  625 nm 
E)  658 nm

Question 8

Consider the Bohr model for the hydrogen atom. (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ∙ s)
(a) How much energy (in eV) is needed to cause a transition of an electron from the second excited state to the third excited state?
(b) What wavelength photon just has enough energy to initiate the transition in (a)?

Accepted Answer

(a) 0.661

Question 9

How many electrons can be found with principal quantum number $n = 3$ in a suitably heavy atom?

Accepted Answer

A)  18 
B)  6 
C)  20 
D)  9 
A)  18 
B)  6 
C)  20 
D)  9

Question 10

To which of the following values of n does the longest wavelength in the Balmer series correspond?

Accepted Answer

A)  3 
B)  5 
C)  1 
D)  7 
E)  ∞ (very large) 
A)  3 
B)  5 
C)  1 
D)  7 
E)  ∞ (very large)

Question 11

The wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

Accepted Answer

A)  122 nm 
B)  203 nm 
C)  243 nm 
D)  389 nm 
E)  411 nm 
A)  122 nm 
B)  203 nm 
C)  243 nm 
D)  389 nm 
E)  411 nm

Question 12

The Paschen series is formed by electron transitions that

Accepted Answer

A)  end on the n = 1 shell. 
B)  begin on the n = 1 shell. 
C)  end on the n = 2 shell. 
D)  begin on the n = 3 shell. 
E)  end on the n = 3 shell. 
A)  end on the n = 1 shell. 
B)  begin on the n = 1 shell. 
C)  end on the n = 2 shell. 
D)  begin on the n = 3 shell. 
E)  end on the n = 3 shell.

Question 13

The only invalid electron state and shell designation among the following is

Accepted Answer

A)  1s, K (n = 1) shell. 
B)  2s, L (n = 2) shell. 
C)  2d, L (n = 2) shell. 
D)  3s, M (n = 3) shell. 
E)  3d, M (n = 3) shell. 
A)  1s, K (n = 1) shell. 
B)  2s, L (n = 2) shell. 
C)  2d, L (n = 2) shell. 
D)  3s, M (n = 3) shell. 
E)  3d, M (n = 3) shell.

Question 14

The orbital angular momentum quantum number ℓ can have any integer value ranging from

Accepted Answer

A)  0 to n. 
B)  0 to (n-1). 
C)  1 to n. 
D)  1 to (n+1). 
E)  -n to n. 
A)  0 to n. 
B)  0 to (n-1). 
C)  1 to n. 
D)  1 to (n+1). 
E)  -n to n.

Question 15

The value of a wavelength in the Balmer series is 372.1 nm. What is the corresponding value of n?

Accepted Answer

A)  6 
B)  3 
C)  9 
D)  10 
E)  14 
A)  6 
B)  3 
C)  9 
D)  10 
E)  14

Question 16

The principal quantum number n can have any integer value ranging from

Accepted Answer

A)  -∞ to +∞. 
B)  0 to ∞. 
C)  1 to ∞. 
D)  1 to 100. 
A)  -∞ to +∞. 
B)  0 to ∞. 
C)  1 to ∞. 
D)  1 to 100.

Question 17

Consider the n = 10 shell.
(a) What is the largest value of the angular momentum quantum number, ℓ, in this shell?
(b) How many electrons can be placed in this shell?

Accepted Answer

The answer of Consider the n = 10 shell.
(a) What...

Question 18

What frequency must a photon have to raise an electron in a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

Accepted Answer

A)  3.06 × 1014 Hz 
B)  6.16 × 1014 Hz 
C)  4.11 × 1014 Hz 
D)  5.20 × 1014 Hz 
E)  9.24 × 1014 Hz 
A)  3.06 × 1014 Hz 
B)  6.16 × 1014 Hz 
C)  4.11 × 1014 Hz 
D)  5.20 × 1014 Hz 
E)  9.24 × 1014 Hz

Question 19

A hydrogen atom is in its n = 2 excited state when its electron absorbs $9.5 \mathrm { eV }$ in an interaction with a photon. What is the energy of the resulting free electron?

Accepted Answer

A)  6.1 eV 
B)  7.9 eV 
C)  8.2 eV 
D)  9.2 eV 
A)  6.1 eV 
B)  7.9 eV 
C)  8.2 eV 
D)  9.2 eV

Question 20

A hydrogen atom makes a downward transition from the $n = 15$ state to the $n = 5$ state. Find the wavelength of the emitted photon. (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ∙ s)

Accepted Answer

A)  2.56 μm 
B)  1.54 μm 
C)  2.05 μm 
D)  3.07 μm 
A)  2.56 μm 
B)  1.54 μm 
C)  2.05 μm 
D)  3.07 μm

Exam 29: Atoms and Molecules

The electron spin quantum number can have values of

The Balmer series is formed by electron transitions in hydrogen that

A hydrogen atom is excited to the n = 9 level. Its decay to the n = 6 level detected in a photographic plate. What is the frequency of the light photographed? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ∙ s)

If ℓ = 4, which one of the following is a possible quantum number for n?

How many possible sets of electron states (or quantum numbers) are there in the 5f subshell?

Which one of the following is the correct electronic configuration for carbon, which has 6 electrons?

The longest wavelength of a photon that can be emitted by a hydrogen atom, for which the initial state is n = 3, is closest to which one of the following values? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

How many electrons can be found with principal quantum number n=3n = 3n=3 in a suitably heavy atom?

To which of the following values of n does the longest wavelength in the Balmer series correspond?

The wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values? (c = 3.0 × 108 m/s, h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

The Paschen series is formed by electron transitions that

The only invalid electron state and shell designation among the following is

The orbital angular momentum quantum number ℓ can have any integer value ranging from

The value of a wavelength in the Balmer series is 372.1 nm. What is the corresponding value of n?

The principal quantum number n can have any integer value ranging from

Consider the n = 10 shell. (a) What is the largest value of the angular momentum quantum number, ℓ, in this shell? (b) How many electrons can be placed in this shell?

What frequency must a photon have to raise an electron in a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

A hydrogen atom is in its n = 2 excited state when its electron absorbs 9.5eV9.5 \mathrm { eV }9.5eV in an interaction with a photon. What is the energy of the resulting free electron?

A hydrogen atom makes a downward transition from the n=15n = 15n=15 state to the n=5n = 5n=5 state. Find the wavelength of the emitted photon. (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ∙ s)

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A hydrogen atom is excited to the n = 9 level. Its decay to the n = 6 level detected in a photographic plate. What is the frequency of the light photographed? (1 eV = 1.60 × 10^-19J, h = 6.626 × 10^-34 J ∙ s)

The longest wavelength of a photon that can be emitted by a hydrogen atom, for which the initial state is n = 3, is closest to which one of the following values? (c = 3.00 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.60 × 10^-19J)

How many electrons can be found with principal quantum number $n = 3$ in a suitably heavy atom?

The wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values? (c = 3.0 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.60 × 10^-19J)

What frequency must a photon have to raise an electron in a hydrogen atom from the n = 2 to the n = 4 state? (h = 6.626 × 10^-34 J ∙ s, 1 eV = 1.60 × 10^-19J)

A hydrogen atom is in its n = 2 excited state when its electron absorbs $9.5 \mathrm { eV }$ in an interaction with a photon. What is the energy of the resulting free electron?

A hydrogen atom makes a downward transition from the $n = 15$ state to the $n = 5$ state. Find the wavelength of the emitted photon. (c = 3.00 × 10⁸ m/s, 1 eV = 1.60 × 10^-19J, h = 6.626 × 10^-³⁴ J ∙ s)