Question 1

What is the electron configuration for ground state Li, which has 3 electrons?

Accepted Answer

A)  1s3 
B)  1s12s2 
C)  1s22s1 
D)  1s21p1 
E)  1s11p2 
A)  1s3 
B)  1s12s2 
C)  1s22s1 
D)  1s21p1 
E)  1s11p2

Question 2

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

Accepted Answer

A)  2 
B)  6 
C)  8 
D)  10 
E)  14 
A)  2 
B)  6 
C)  8 
D)  10 
E)  14

Question 3

An alkali metal atom is in the ground state. The orbital angular momentum equals zero and the spin angular momentum is entirely due to the single valence electron. A magnetic field is applied that splits the ground state energy level into two levels, 27 μeV apart. What is the strength of the applied magnetic field? (h = 6.626 × 10-34 J ∙ s, Bohr magneton = μB = 9.27 × 10-24 J/T, 1 eV = 1.60 × 10-19 J)

Accepted Answer

A)  0.23 T 
B)  0.18 T 
C)  0.29 T 
D)  0.34 T 
E)  0.40 T 
A)  0.23 T 
B)  0.18 T 
C)  0.29 T 
D)  0.34 T 
E)  0.40 T

Question 4

How many electrons does it take to fill the d subshell?

Accepted Answer

A)  10 
B)  6 
C)  14 
D)  4 
E)  8 
A)  10 
B)  6 
C)  14 
D)  4 
E)  8

Question 5

How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10-19 J, mH ≈ mproton = 1.67 × 10-27 kg)

Accepted Answer

A)  44.2 km/s 
B)  21.7 km/s 
C)  66.5 km/s 
D)  113 km/s 
E)  51.0 km/s 
A)  44.2 km/s 
B)  21.7 km/s 
C)  66.5 km/s 
D)  113 km/s 
E)  51.0 km/s

Question 6

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 7

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 8

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

Accepted Answer

A)  1p, K. 
B)  2s, K. 
C)  1s, L. 
D)  2p, L. 
E)  3f, M. 
A)  1p, K. 
B)  2s, K. 
C)  1s, L. 
D)  2p, L. 
E)  3f, M.

Question 9

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 10

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 11

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

Accepted Answer

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

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

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 14

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

Question 15

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 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

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 18

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 
E)  -68 eV 
A)  2.72 eV 
B)  -2.72 eV 
C)  0.544 eV 
D)  -0.544 eV 
E)  -68 eV

Question 19

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ. Which of the following angles could NOT be the angle between the orbital angular momentum vector of the electron and an arbitrary z-direction?

Accepted Answer

A)  107° 
B)  90.0° 
C)  73.2° 
D)  54.7° 
E)  0.00° 
A)  107° 
B)  90.0° 
C)  73.2° 
D)  54.7° 
E)  0.00°

Question 20

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

Accepted Answer

A)  8 
B)  9 
C)  3 
D)  4 
E)  10 
A)  8 
B)  9 
C)  3 
D)  4 
E)  10

Exam 40: Atomic Structure

What is the electron configuration for ground state Li, which has 3 electrons?

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

How many electrons does it take to fill the d subshell?

How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10-19 J, mH ≈ mproton = 1.67 × 10-27 kg)

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

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?

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

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

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?

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

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

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

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?

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

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?

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?

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?

The magnitude of the orbital angular momentum L of an electron in a certain atom is equal to 3.464ħ. Which of the following angles could NOT be the angle between the orbital angular momentum vector of the electron and an arbitrary z-direction?

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

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How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10^-19 J, ^mH ≈ mproton = 1.67 × 10^-27 kg)

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?

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

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