Question 1

The values of n and ℓ for a 4f subshell are

Accepted Answer

A)  n = 4, ℓ = 4. 
B)  n = 4, ℓ = 3. 
C)  n = 3, ℓ = 3. 
D)  n = 4, ℓ = 2. 
E)  n = 3, ℓ = -3. 
A)  n = 4, ℓ = 4. 
B)  n = 4, ℓ = 3. 
C)  n = 3, ℓ = 3. 
D)  n = 4, ℓ = 2. 
E)  n = 3, ℓ = -3. B

Question 2

The energy difference between adjacent orbit radii in a hydrogen atom

Accepted Answer

A)  increases with increasing values of n. 
B)  decreases with increasing values of n. 
C)  remains constant for all values of n. 
D)  varies randomly with increasing values of n. 
A)  increases with increasing values of n. 
B)  decreases with increasing values of n. 
C)  remains constant for all values of n. 
D)  varies randomly with increasing values of n. B

Question 3

The distance between adjacent orbits in a hydrogen atom

Accepted Answer

A)  increases with increasing values of n. 
B)  decreases with increasing values of n. 
C)  remains constant for all values of n. 
D)  varies randomly with increasing values of n. 
A)  increases with increasing values of n. 
B)  decreases with increasing values of n. 
C)  remains constant for all values of n. 
D)  varies randomly with increasing values of n. A

Question 4

How many 3d electron states can an atom have?

Accepted Answer

A)  0 
B)  4 
C)  6 
D)  8 
E)  10 
A)  0 
B)  4 
C)  6 
D)  8 
E)  10

Question 5

Light shines through atomic hydrogen gas that was initially in its ground state. You observe that after awhile much of the hydrogen gas has been excited to its n = 5 state. What wavelength of light entering the gas caused this excitation? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

Accepted Answer

A)  110 nm 
B)  91.4 nm 
C)  95.2 nm 
D)  2280 nm 
A)  110 nm 
B)  91.4 nm 
C)  95.2 nm 
D)  2280 nm

Question 6

An atom with atomic number 6 is in its ground state. How many electrons are in its outermost shell?

Accepted Answer

The answer of An atom with atomic number 6 is...

Question 7

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

Accepted Answer

A)  822 nm 
B)  850 nm 
C)  103 nm 
D)  91.4 nm 
E)  950 nm 
A)  822 nm 
B)  850 nm 
C)  103 nm 
D)  91.4 nm 
E)  950 nm

Question 8

Given that the binding energy of the hydrogen atom in its ground state is -13.6 eV, what is the energy when it is in the n = 5 state?

Accepted Answer

A)  2.72 eV 
B)  -2.72 eV 
C)  0.544 eV 
D)  -0.544 eV 
A)  2.72 eV 
B)  -2.72 eV 
C)  0.544 eV 
D)  -0.544 eV

Question 9

What is the ionization energy of the neutral hydrogen atom?

Accepted Answer

A)  27.2 eV 
B)  13.6 eV 
C)  6.8 eV 
D)  none of the given answers 
A)  27.2 eV 
B)  13.6 eV 
C)  6.8 eV 
D)  none of the given answers

Question 10

For an electron in the M (n = 3) shell, find (a) the largest possible orbital angular momentum it can have, and (b) the smallest possible orbital angular momentum it can have. Express your answers in SI units, and for each case indicate the subshell (s, p, d, ...) of the electron. (h = 6.626 × 10-34 J ∙ s)

Accepted Answer

(a) 2.583 × 10^-34 kg ∙

Question 11

In a hydrogen atom, a given electron has n = 7. How many possible values can ℓ have?

Accepted Answer

A)  6 
B)  7 
C)  15 
D)  98 
A)  6 
B)  7 
C)  15 
D)  98

Question 12

What is the correct ground state electron configuration of boron, which has 5 electrons?

Accepted Answer

A)  1s2 2s2 2p 
B)  1s2 2s2 2p3 
C)  1s2 1p2 2s 
D)  1s2 2p2 3s 
E)  1s2 2p3 
A)  1s2 2s2 2p 
B)  1s2 2s2 2p3 
C)  1s2 1p2 2s 
D)  1s2 2p2 3s 
E)  1s2 2p3

Question 13

Radio astronomers often study the radiation emitted by a hydrogen atom from a transition between the two hyperfine levels associated with the ground state. This radiation has a wavelength of 21 cm. What is the energy difference between the hyperfine levels? (1 eV = 1.60 × 10-19 J)

Accepted Answer

A)  5.9 × 10-6 eV 
B)  5.9 × 10-25 J 
C)  1.7 × 10-24 J 
D)  4.7 × 10-25 J 
A)  5.9 × 10-6 eV 
B)  5.9 × 10-25 J 
C)  1.7 × 10-24 J 
D)  4.7 × 10-25 J

Question 14

If a hydrogen atom in the ground state absorbs a photon of energy 12.09 eV, to which state will the electron make a transition?

Accepted Answer

A)  n = 2 
B)  n = 3 
C)  n = 4 
D)  n = 5 
A)  n = 2 
B)  n = 3 
C)  n = 4 
D)  n = 5

Question 15

The longest wavelength photon that can be emitted by a hydrogen atom, for which the final state is $n = 9 ,$ is closest to which one of the following values? (c = 3.0 × 108 m/s, $1 \mathrm { eV } = 1.60 \times 10 ^ { - 19 } \mathrm {~J}$ $\left. h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s } \right)$

Accepted Answer

A)  39,000 nm 
B)  22,000 nm 
C)  7400 nm 
D)  16,000 nm 
E)  28,000 nm 
A)  39,000 nm 
B)  22,000 nm 
C)  7400 nm 
D)  16,000 nm 
E)  28,000 nm

Question 16

What is the atomic number of a neutral atom that has an electron configuration of 1s2 2s2 2p6 3s2 3p2?

Accepted Answer

A)  5 
B)  11 
C)  14 
D)  20 
A)  5 
B)  11 
C)  14 
D)  20

Question 17

Consider ground-state helium having two electrons in orbit. If one of the electrons has quantum numbers (n, ℓl, m1, ms) of 1, 0, 0, -1/2 respectively, the quantum numbers for the other electron will be

Accepted Answer

A)  1, 1, 0, -1/2. 
B)  1, 0, 0, +1/2. 
C)  1, 1, 1, +1/2. 
D)  none of the given answers. 
A)  1, 1, 0, -1/2. 
B)  1, 0, 0, +1/2. 
C)  1, 1, 1, +1/2. 
D)  none of the given answers.

Question 18

What value of n corresponds to a wavelength of 91.7 nm in the Lyman series?

Accepted Answer

A)  1 
B)  3 
C)  5 
D)  9 
E)  13 
A)  1 
B)  3 
C)  5 
D)  9 
E)  13

Question 19

In a hydrogen atom, the electron makes a transition from the n = 8 to the n = 3 state. The wavelength of the emitted photon is closest to which one of the following values? 
(c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ∙ s)

Accepted Answer

A)  9.57 × 10-7 m 
B)  1.13 × 10-6 m 
C)  3.12 × 10-7 m 
D)  4.52 × 10-6 m 
E)  6.34 × 10-7 m 
A)  9.57 × 10-7 m 
B)  1.13 × 10-6 m 
C)  3.12 × 10-7 m 
D)  4.52 × 10-6 m 
E)  6.34 × 10-7 m

Question 20

Hydrogen atoms can emit four spectral lines with visible colors from red to violet. These four visible lines emitted by hydrogen atoms are produced by electrons

Accepted Answer

A)  that start in the n = 2 level. 
B)  that end up in the n = 2 level. 
C)  that end up in the n = 3 level. 
D)  that end up in the ground state. 
E)  that start in the ground state. 
A)  that start in the n = 2 level. 
B)  that end up in the n = 2 level. 
C)  that end up in the n = 3 level. 
D)  that end up in the ground state. 
E)  that start in the ground state.

Exam 29: Atoms and Molecules

The values of n and ℓ for a 4f subshell are

The energy difference between adjacent orbit radii in a hydrogen atom

The distance between adjacent orbits in a hydrogen atom

How many 3d electron states can an atom have?

An atom with atomic number 6 is in its ground state. How many electrons are in its outermost shell?

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

Given that the binding energy of the hydrogen atom in its ground state is -13.6 eV, what is the energy when it is in the n = 5 state?

What is the ionization energy of the neutral hydrogen atom?

In a hydrogen atom, a given electron has n = 7. How many possible values can ℓ have?

What is the correct ground state electron configuration of boron, which has 5 electrons?

Radio astronomers often study the radiation emitted by a hydrogen atom from a transition between the two hyperfine levels associated with the ground state. This radiation has a wavelength of 21 cm. What is the energy difference between the hyperfine levels? (1 eV = 1.60 × 10-19 J)

If a hydrogen atom in the ground state absorbs a photon of energy 12.09 eV, to which state will the electron make a transition?

What is the atomic number of a neutral atom that has an electron configuration of 1s2 2s2 2p6 3s2 3p2?

Consider ground-state helium having two electrons in orbit. If one of the electrons has quantum numbers (n, ℓl, m1, ms) of 1, 0, 0, -1/2 respectively, the quantum numbers for the other electron will be

What value of n corresponds to a wavelength of 91.7 nm in the Lyman series?

In a hydrogen atom, the electron makes a transition from the n = 8 to the n = 3 state. The wavelength of the emitted photon is closest to which one of the following values? (c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ∙ s)

Hydrogen atoms can emit four spectral lines with visible colors from red to violet. These four visible lines emitted by hydrogen atoms are produced by electrons

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

Radio astronomers often study the radiation emitted by a hydrogen atom from a transition between the two hyperfine levels associated with the ground state. This radiation has a wavelength of 21 cm. What is the energy difference between the hyperfine levels? (1 eV = 1.60 × 10^-19 J)

What is the atomic number of a neutral atom that has an electron configuration of 1s²2s²2p⁶3s²3p²?

Consider ground-state helium having two electrons in orbit. If one of the electrons has quantum numbers (n, ℓl, m₁, m_s) of 1, 0, 0, -1/2 respectively, the quantum numbers for the other electron will be

In a hydrogen atom, the electron makes a transition from the n = 8 to the n = 3 state. The wavelength of the emitted photon is closest to which one of the following values? (c = 3.00 × 10⁸ m/s, 1 eV = 1.60 × 10^-19J, h = 6.626 × 10^-34 J ∙ s)