Question 1

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state.
-[Ar] 4s23d7

Accepted Answer

The element is Co wi...

Question 2

Write the electron configuration for the following:
-Cu

Accepted Answer

1s²2s²2p⁶3s²3p...

Question 3

An electron in a one-dimensional box requires energy with wavelength 8080 nm to excite it from the n = 2 energy level to the n = 3 energy level. Calculate the length of the box.

Accepted Answer

A)   1.50 nm
B)   3.00 nm
C)   1.00 nm
D)   2.50 nm
E)   3.50 nmF) C) and D)
G) A) and B)

Question 4

The energy equation for a particle in a cubic box of dimensions Lx = Ly = Lz is
Enx, ny, nz =  
Assume that 8 electrons occupy the allowed energy levels and that 2 electrons can occupy each allowed energy level.

Accepted Answer

A. 2
B. 6
...

Question 5

Which orbital has the highest energy in the rubidium atom?

Accepted Answer

A)   4p
B)   4s
C)   5s
D)   1s
E)   4dF) A) and D)
G) A) and C)

Question 6

From the following list of observations, choose the one that most clearly supports the conclusion that the mass of the atom is located mainly in the nucleus.

Accepted Answer

A)   the emission spectrum of hydrogen
B)   the photoelectric effect
C)   diffraction
D)   the scattering of alpha particles by metal foil
E)   cathode "rays"F) B) and C)
G) A) and B)

Question 7

Place the elements C, N, and O in order of increasing ionization energy.

Accepted Answer

A)   N, O, C
B)   C, N, O
C)   O, N, C
D)   C, O, N
E)   none of theseF) A) and D)
G) A) and E)

Question 8

How many unpaired electrons does chlorine have in its ground state?

Accepted Answer

A)   2
B)   3
C)   17
D)   1
E)   none of theseF) C) and D)
G) B) and D)

Question 9

The energy equation for a particle in a cubic box of dimensions Lx = Ly = Lz is
Enx, ny, nz = y = Lz is Enx, ny, nz =   For a particle in a cubic box, how many degenerate energy levels have energy equal to 14 h2/8 mL2? A)  1 B)  12 C)  6 D)  8 E)  3" class="answers-bank-image d-inline" rel="preload" >
For a particle in a cubic box, how many degenerate energy levels have energy equal to 14 h2/8 mL2?

Accepted Answer

A)   1
B)   12
C)   6
D)   8
E)   3F) B) and C)
G) B) and D)

Question 10

In an investigation of the electronic absorption spectrum of a particular element, it is found that a photon having λ = 500 nm provides just enough energy to promote an electron from the second quantum level to the third. From this information, we can deduce

Accepted Answer

A)   the energy of the n = 2 level.
B)   the sum of the energies of the n = 2 and n = 3 levels.
C)   the difference between the energies of the n = 2 and n = 3 levels.
D)   the energy of the n = 3 level.
E)   all of these.F) A) and B)
G) A) and C)

Question 11

What is the wavelength, in nanometers, of a photon of light whose frequency is 5.40 × 1014 Hz?

Accepted Answer

A)   1.19 × 10-7 nm
B)   2.72 × 102 nm
C)   5.56 × 102 nm
D)   1.80 × 102 nm
E)   3.68 × 102 nmF) All of the above
G) A) and B)

Question 12

What is the electron configuration of Co3+?

Accepted Answer

A)   [Ar] 3d6
B)   [Ar] 4s24d4
C)   [Ar] 3d4
D)   [Ar] 4s23d4
E)   none of theseF) B) and E)
G) C) and D)

Question 13

What is the electron configuration for the chromium atom?

Accepted Answer

A)   [Kr] 4s13d5
B)   [Ar] 4s23d4
C)   [Kr] 4s23d4
D)   [Ar] 4s13d5
E)   none of theseF) None of the above
G) A) and E)

Question 14

In which groups do all the elements have the same number of valence electrons?

Accepted Answer

A)   O, S, Se
B)   N, As, Se
C)   Ag, Cd, Ar
D)   Na, Ca, Ba
E)   N, O, BrF) B) and C)
G) None of the above

Question 15

Which of the following statements is(are)  true?
i. An excited atom can return to its ground state by absorbing electromagnetic radiation.II. The energy of an atom is increased when electromagnetic radiation is emitted from it.III. The energy of electromagnetic radiation increases as its frequency increases.IV. An electron in the n = 4 state in the hydrogen atom can go to the n = 2 state by emitting electromagnetic radiation at the appropriate frequency.V. The frequency and wavelength of electromagnetic radiation are inversely proportional to each other.

Accepted Answer

A)   III, V
B)   II, III, IV
C)   I, II, IV
D)   I, II, III
E)   III, IV, VF) C) and D)
G) A) and E)

Question 16

Light has a wavelength of 5.6 × 102 nm. What is the energy of a photon of this light?

Accepted Answer

A)   2.53× 1018 J
B)   3.95 × 10-20 J
C)   1.24 × 10-18 J
D)   1.18 × 10-19 J
E)   3.55 × 10-19 JF) C) and E)
G) A) and E)

Question 17

How many electrons can be described by the quantum numbers n = 4, l = 3, ml = 0?

Accepted Answer

A)   2
B)   10
C)   6
D)   0
E)   14F) D) and E)
G) A) and E)

Question 18

Consider the following portion of the energy-level diagram for hydrogen: 
-What is the probability of finding a particle in a one-dimensional box in energy level n = 4 between x = L/4 and x = L/2? (L is the length of the box.)

Accepted Answer

A)   50%
B)   12.5%
C)   33%
D)   25%
E)   37.5%F) A) and E)
G) A) and C)

Question 19

Consider the following orderings.
I. Al + 2+ 3+ 4+
-Which of the following statements is true of second ionization energies?

Accepted Answer

A)   That of Al is higher than that of Mg because Mg wants to lose the second electron, so it is easier to take the second electron away.
B)   That of Al is lower than that of Mg because the second electron taken from Al is in a p orbital, so it is easier to take away.
C)   That of Al is lower than that of Mg because Mg wants to lose the second electron, so the energy change is greater.
D)   The second ionization energies are equal for Al and Mg.
E)   That of Al is higher than that of Mg because the electrons are taken from the same energy level, but the Al atom has one more proton.F) All of the above
G) B) and D)

Question 20

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state.
-[Xe] 4f146s25d2

Accepted Answer

The element is Hf wi...

Exam 12: Quantum Mechanics and Atomic Theory

Which orbital has the highest energy in the rubidium atom?

Correct Answer
verified

The energy equation for a particle in a cubic box of dimensions Lx = L_y = Lz is E_{nx, ny, nz} = Assume that 8 electrons occupy the allowed energy levels and that 2 electrons can occupy each allowed energy level.

Correct Answer
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A. 2
B. 6
...
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In which groups do all the elements have the same number of valence electrons?

Correct Answer
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Consider the following portion of the energy-level diagram for hydrogen: -What is the probability of finding a particle in a one-dimensional box in energy level n = 4 between x = L/4 and x = L/2? (L is the length of the box.)

Correct Answer
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How many unpaired electrons does chlorine have in its ground state?

Correct Answer
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What is the electron configuration for the chromium atom?

Correct Answer
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What is the wavelength, in nanometers, of a photon of light whose frequency is 5.40 × 10¹⁴ Hz?

Correct Answer
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An electron in a one-dimensional box requires energy with wavelength 8080 nm to excite it from the n = 2 energy level to the n = 3 energy level. Calculate the length of the box.

Correct Answer
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Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -[Ar] 4s²3d⁷

Correct Answer
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The element is Co wi...
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Place the elements C, N, and O in order of increasing ionization energy.

Correct Answer
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What is the electron configuration of Co³⁺?

Correct Answer
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Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -[Xe] 4f¹⁴6s²5d²

Correct Answer
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The element is Hf wi...
View Answer

The energy equation for a particle in a cubic box of dimensions Lx = L_y = Lz is Enx_, _{ny, nz} = For a particle in a cubic box, how many degenerate energy levels have energy equal to 14 h²/8 mL²?

Correct Answer
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Write the electron configuration for the following: -Cu

Correct Answer
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1s²2s²2p⁶3s²3p...
View Answer

Correct Answer
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In an investigation of the electronic absorption spectrum of a particular element, it is found that a photon having λ = 500 nm provides just enough energy to promote an electron from the second quantum level to the third. From this information, we can deduce

Correct Answer
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From the following list of observations, choose the one that most clearly supports the conclusion that the mass of the atom is located mainly in the nucleus.

Correct Answer
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Light has a wavelength of 5.6 × 10² nm. What is the energy of a photon of this light?

Correct Answer
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How many electrons can be described by the quantum numbers n = 4, l = 3, m_l = 0?

Correct Answer
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Consider the following orderings. I. Al < Si < P < Cl II. Be < Mg < Ca < Sr III. I < Br < Cl < F IV. Na⁺ < Mg²⁺ < Al³⁺ < Si⁴⁺ -Which of the following statements is true of second ionization energies?

Correct Answer
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Exam 12: Quantum Mechanics and Atomic Theory

Which orbital has the highest energy in the rubidium atom?

Correct AnswerverifiedShow Answer

The energy equation for a particle in a cubic box of dimensions Lx = Ly = Lz is Enx, ny, nz = Assume that 8 electrons occupy the allowed energy levels and that 2 electrons can occupy each allowed energy level.

Correct AnswerverifiedA. 2B. 6...View AnswerShow Answer

In which groups do all the elements have the same number of valence electrons?

Correct AnswerverifiedShow Answer

Consider the following portion of the energy-level diagram for hydrogen: -What is the probability of finding a particle in a one-dimensional box in energy level n = 4 between x = L/4 and x = L/2? (L is the length of the box.)

Correct AnswerverifiedShow Answer

How many unpaired electrons does chlorine have in its ground state?

Correct AnswerverifiedShow Answer

What is the electron configuration for the chromium atom?

Correct AnswerverifiedShow Answer

What is the wavelength, in nanometers, of a photon of light whose frequency is 5.40 × 1014 Hz?

Correct AnswerverifiedShow Answer

An electron in a one-dimensional box requires energy with wavelength 8080 nm to excite it from the n = 2 energy level to the n = 3 energy level. Calculate the length of the box.

Correct AnswerverifiedShow Answer

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -[Ar] 4s23d7

Correct AnswerverifiedThe element is Co wi...View AnswerShow Answer

Place the elements C, N, and O in order of increasing ionization energy.

Correct AnswerverifiedShow Answer

What is the electron configuration of Co3+?

Correct AnswerverifiedShow Answer

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -[Xe] 4f146s25d2

Correct AnswerverifiedThe element is Hf wi...View AnswerShow Answer

The energy equation for a particle in a cubic box of dimensions Lx = Ly = Lz is Enx, ny, nz = For a particle in a cubic box, how many degenerate energy levels have energy equal to 14 h2/8 mL2?

Correct AnswerverifiedShow Answer

Write the electron configuration for the following: -Cu

Correct Answerverified1s22s22p63s23p...View AnswerShow Answer

Correct AnswerverifiedShow Answer

In an investigation of the electronic absorption spectrum of a particular element, it is found that a photon having λ = 500 nm provides just enough energy to promote an electron from the second quantum level to the third. From this information, we can deduce

Correct AnswerverifiedShow Answer

From the following list of observations, choose the one that most clearly supports the conclusion that the mass of the atom is located mainly in the nucleus.

Correct AnswerverifiedShow Answer

Light has a wavelength of 5.6 × 102 nm. What is the energy of a photon of this light?

Correct AnswerverifiedShow Answer

How many electrons can be described by the quantum numbers n = 4, l = 3, ml = 0?

Correct AnswerverifiedShow Answer

Consider the following orderings. I. Al < Si < P < Cl II. Be < Mg < Ca < Sr III. I < Br < Cl < F IV. Na+ < Mg2+ < Al3+ < Si4+ -Which of the following statements is true of second ionization energies?

Correct AnswerverifiedShow Answer

Correct Answer
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The energy equation for a particle in a cubic box of dimensions Lx = L_y = Lz is E_{nx, ny, nz} = Assume that 8 electrons occupy the allowed energy levels and that 2 electrons can occupy each allowed energy level.

Correct Answer
verified
A. 2
B. 6
...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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What is the wavelength, in nanometers, of a photon of light whose frequency is 5.40 × 10¹⁴ Hz?

Correct Answer
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Correct Answer
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Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -[Ar] 4s²3d⁷

Correct Answer
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The element is Co wi...
View Answer

Correct Answer
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What is the electron configuration of Co³⁺?

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Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -[Xe] 4f¹⁴6s²5d²

Correct Answer
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The element is Hf wi...
View Answer

The energy equation for a particle in a cubic box of dimensions Lx = L_y = Lz is Enx_, _{ny, nz} = For a particle in a cubic box, how many degenerate energy levels have energy equal to 14 h²/8 mL²?

Correct Answer
verified

Correct Answer
verified
1s²2s²2p⁶3s²3p...
View Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Light has a wavelength of 5.6 × 10² nm. What is the energy of a photon of this light?

Correct Answer
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How many electrons can be described by the quantum numbers n = 4, l = 3, m_l = 0?

Correct Answer
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Consider the following orderings. I. Al < Si < P < Cl II. Be < Mg < Ca < Sr III. I < Br < Cl < F IV. Na⁺ < Mg²⁺ < Al³⁺ < Si⁴⁺ -Which of the following statements is true of second ionization energies?

Correct Answer
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