Question 1

An atom with 5 electrons is in its ground state. How many electrons are in its outermost shell?

Accepted Answer

The answer of An atom with 5 electrons is in...

Question 2

A collection of atoms has 20% of the sample in a state 5.9 eV above the ground state. If these emit coherent radiation, what is the wavelength of the laser light produced? (c = 3.00 × 108 m/s,
H = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

Accepted Answer

A)  210 nm 
B)  91 nm 
C)  340 nm 
D)  34 nm 
A)  210 nm 
B)  91 nm 
C)  340 nm 
D)  34 nm

Question 3

If an electron has spin quantum number ms = -   what is the possible value for the orbital quantum number l of the electron?

Accepted Answer

A)  0 
B)  1 
C)  2 
D)  11 
E)  All of the above numbers are possible. 
A)  0 
B)  1 
C)  2 
D)  11 
E)  All of the above numbers are possible.

Question 4

An electron in a hydrogen atom has orbital quantum number l = 7. How many possible values of the magnetic quantum number ml could it have?

Accepted Answer

A)  6 
B)  7 
C)  15 
D)  33 
E)  98 
A)  6 
B)  7 
C)  15 
D)  33 
E)  98

Question 5

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 6

What is the energy of an incident photon that is just enough to excite a hydrogen atom from its ground state to its n = 4 state?

Accepted Answer

A)  12.75 eV 
B)  10.20 eV 
C)  3.40 eV 
D)  0.85 eV 
A)  12.75 eV 
B)  10.20 eV 
C)  3.40 eV 
D)  0.85 eV

Question 7

You need 14 W of infrared laser light power with wavelength 1270 nm to bore a hole in a diamond. How many downward atomic transitions per second must occur in the laser if all of them result in light directed onto the diamond? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ∙ s)

Accepted Answer

A)  8.9 × 1019 
B)  8.9 × 1018 
C)  5.9 × 1019 
D)  2.7 × 1018 
A)  8.9 × 1019 
B)  8.9 × 1018 
C)  5.9 × 1019 
D)  2.7 × 1018

Question 8

Consider the four quantum numbers of an electron in an atom, n, l, ml, and ms. The energy of an electron in an isolated atom depends on

Accepted Answer

A)  n only. 
B)  n and l only. 
C)  n, l, and ml only. 
D)  l, ml, and ms only. 
E)  all four quantum numbers. 
A)  n only. 
B)  n and l only. 
C)  n, l, and ml only. 
D)  l, ml, and ms only. 
E)  all four quantum numbers.

Question 9

An electron in a hydrogen atom is in the n = 7 shell. How many possible values of the orbital quantum number l could it have?

Accepted Answer

A)  6 
B)  7 
C)  15 
D)  33 
E)  98 
A)  6 
B)  7 
C)  15 
D)  33 
E)  98

Question 10

In the ground state, the quantum numbers (n, l, ml, ms) for hydrogen are, respectively

Accepted Answer

A)  1, 1, 1, 1 
B)  1, 0, 0, 0 
C)  1, 0, 0, ±   
D)  1, 1, 1, ±   
E)  1, 1, 0, ±   
A)  1, 1, 1, 1 
B)  1, 0, 0, 0 
C)  1, 0, 0, ±   
D)  1, 1, 1, ±   
E)  1, 1, 0, ±

Question 11

If the principal quantum number of an electron is n = 5, which one of the following is NOT an allowed magnetic quantum number ml for the electron?

Accepted Answer

A)  0 
B)  2 
C)  3 
D)  4 
E)  5 
A)  0 
B)  2 
C)  3 
D)  4 
E)  5

Question 12

What is the greatest magnitude of the orbital angular momentum L for an electron in a state with principal quantum number n = 5?

Accepted Answer

A)  4.47   
B)  4.90   
C)  5   
D)  5.48   
A)  4.47   
B)  4.90   
C)  5   
D)  5.48

Question 13

A neutral atom has an electron configuration of 1s22s22p63s23p2. How many protons does it have in its nucleus?

Accepted Answer

A)  5 
B)  11 
C)  14 
D)  20 
E)  26 
A)  5 
B)  11 
C)  14 
D)  20 
E)  26

Question 14

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

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  8 
A)  1 
B)  2 
C)  3 
D)  4 
E)  8

Question 15

For each value of the principal quantum number n, what are the possible values of the electron spin quantum number ms? (There may be more than one correct choice.)

Accepted Answer

A)  0 
B)  +1/2 
C)  -1/2 
D)  +3/2 
E)  -3/2 
A)  0 
B)  +1/2 
C)  -1/2 
D)  +3/2 
E)  -3/2

Question 16

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ. What is the orbital quantum number l of the electron?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 17

The normalized wave function for a hydrogen atom in the 1s state is given by ψ(r) =   e-r/α0 where α0 is the Bohr radius, which is equal to 5.29 × 10-11 m. What is the probability of finding the electron at a distance greater than 7.8 α0 from the proton?

Accepted Answer

A)  2.3 × 10-5 
B)  1.2 × 10-5 
C)  1.7 × 10-5 
D)  4.6 × 10-5 
E)  3.5 × 10-5 
A)  2.3 × 10-5 
B)  1.2 × 10-5 
C)  1.7 × 10-5 
D)  4.6 × 10-5 
E)  3.5 × 10-5

Question 18

An electron in a hydrogen atom has orbital quantum number l = 4. How many possible values of the magnetic quantum number ml could it have?

Accepted Answer

A)  4 
B)  10 
C)  5 
D)  9 
E)  3 
A)  4 
B)  10 
C)  5 
D)  9 
E)  3

Question 19

An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero. What is the magnitude of the orbital angular momentum L of the atom?

Accepted Answer

A)  1.0ħ 
B)  1.2ħ 
C)  1.4ħ 
D)  1.7ħ 
E)  2.0ħ 
A)  1.0ħ 
B)  1.2ħ 
C)  1.4ħ 
D)  1.7ħ 
E)  2.0ħ

Exam 41: Atomic Physics

An atom with 5 electrons is in its ground state. How many electrons are in its outermost shell?

A collection of atoms has 20% of the sample in a state 5.9 eV above the ground state. If these emit coherent radiation, what is the wavelength of the laser light produced? (c = 3.00 × 108 m/s, H = 6.626 × 10-34 J ∙ s, 1 eV = 1.60 × 10-19 J)

If an electron has spin quantum number ms = - what is the possible value for the orbital quantum number l of the electron?

An electron in a hydrogen atom has orbital quantum number l = 7. How many possible values of the magnetic quantum number ml could it have?

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

What is the energy of an incident photon that is just enough to excite a hydrogen atom from its ground state to its n = 4 state?

You need 14 W of infrared laser light power with wavelength 1270 nm to bore a hole in a diamond. How many downward atomic transitions per second must occur in the laser if all of them result in light directed onto the diamond? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ∙ s)

Consider the four quantum numbers of an electron in an atom, n, l, ml, and ms. The energy of an electron in an isolated atom depends on

An electron in a hydrogen atom is in the n = 7 shell. How many possible values of the orbital quantum number l could it have?

In the ground state, the quantum numbers (n, l, ml, ms) for hydrogen are, respectively

If the principal quantum number of an electron is n = 5, which one of the following is NOT an allowed magnetic quantum number ml for the electron?

What is the greatest magnitude of the orbital angular momentum L for an electron in a state with principal quantum number n = 5?

A neutral atom has an electron configuration of 1s22s22p63s23p2. How many protons does it have in its nucleus?

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

For each value of the principal quantum number n, what are the possible values of the electron spin quantum number ms? (There may be more than one correct choice.)

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ. What is the orbital quantum number l of the electron?

The normalized wave function for a hydrogen atom in the 1s state is given by ψ(r) = e-r/α0 where α0 is the Bohr radius, which is equal to 5.29 × 10-11 m. What is the probability of finding the electron at a distance greater than 7.8 α0 from the proton?

An electron in a hydrogen atom has orbital quantum number l = 4. How many possible values of the magnetic quantum number ml could it have?

An atom has completely filled inner shells and a single valence electron in an excited p state. The filled inner shells have an orbital momentum equal to zero. What is the magnitude of the orbital angular momentum L of the atom?

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A collection of atoms has 20% of the sample in a state 5.9 eV above the ground state. If these emit coherent radiation, what is the wavelength of the laser light produced? (c = 3.00 × 10⁸ m/s, H = 6.626 × 10^-34 J ∙ s, 1 eV = 1.60 × 10^-19 J)

If an electron has spin quantum number m_s = - what is the possible value for the orbital quantum number l of the electron?

An electron in a hydrogen atom has orbital quantum number l = 7. How many possible values of the magnetic quantum number m_l could it have?

You need 14 W of infrared laser light power with wavelength 1270 nm to bore a hole in a diamond. How many downward atomic transitions per second must occur in the laser if all of them result in light directed onto the diamond? (c = 3.00 × 10⁸ m/s, h = 6.626 × 10^-34 J ∙ s)

Consider the four quantum numbers of an electron in an atom, n, l, m_l, and m_s. The energy of an electron in an isolated atom depends on

In the ground state, the quantum numbers (n, l, m_l, m_s) for hydrogen are, respectively

If the principal quantum number of an electron is n = 5, which one of the following is NOT an allowed magnetic quantum number m_l for the electron?

A neutral atom has an electron configuration of 1s²2s²2p⁶3s²3p². How many protons does it have in its nucleus?

For each value of the principal quantum number n, what are the possible values of the electron spin quantum number m_s? (There may be more than one correct choice.)

The normalized wave function for a hydrogen atom in the 1s state is given by ψ(r) = e^-^r/α₀ where α₀is the Bohr radius, which is equal to 5.29 × 10^-11 m. What is the probability of finding the electron at a distance greater than 7.8 α₀ from the proton?

An electron in a hydrogen atom has orbital quantum number l = 4. How many possible values of the magnetic quantum number m_l could it have?