Question 1

An atom of nitrogen contains 7 electrons. How many of these electrons are in p orbitals?

Accepted Answer

A)   3
B)   6
C)   10
D)   2
E)   8F) A) and D)
G) B) and E)

Question 2

Which of the following statements about quantum theory is incorrect?

Accepted Answer

A)   No two electrons can have the same four quantum numbers.
B)   The energy and position of an electron cannot be determined simultaneously.
C)   Lower energy orbitals are filled with electrons before higher energy orbitals.
D)   When filling orbitals of equal energy, two electrons will occupy the same orbital before filling a new orbital.
E)   All of these are correct.F) All of the above
G) None of the above

Question 3

In Bohr's atomic theory, when an electron moves from one energy level to another energy level more distant from the nucleus,

Accepted Answer

A)   energy is emitted.
B)   energy is absorbed.
C)   light is emitted.
D)   no change in energy occurs.
E)   none of theseF) A) and B)
G) A) and C)

Question 4

What is the electron configuration of Cr3+?

Accepted Answer

A)   [Ar] 4s23d1
B)   [Ar] 3d3
C)   [Ar] 4s23d4
D)   [Ar] 4s13d2
E)   none of theseF) A) and E)
G) C) and E)

Question 5

what is the speed of the ejected electron? me = 9.11 x 10-31 kg

Accepted Answer

A)   1.36 x 106 m/s
B)   3.84 x 105 m/s
C)   1.21 x 106 m/s
D)   1.48 x 106 m/s
E)   none of the aboveF) A) and B)
G) C) and D)

Question 6

In an investigation of the electronic absorption spectrum of a particular element, it is found that a photon having  λ\lambdaλ  = 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) B) and C)

Question 7

Consider the following portion of the energy-level diagram for hydrogen: -8 cm B)  364.9 nm C)  9.122 * 10-8 m D)  1.097 nm E)  1.216 *10-7 m " class="answers-bank-image d-inline" rel="preload" >
-In the hydrogen spectrum, what is the wavelength of light associated with the n = 2 to n = 1 electron transition?

Accepted Answer

A)   0.1097*10-8 cm
B)   364.9 nm
C)   9.122 * 10-8 m
D)   1.097 nm
E)   1.216 *10-7 mF) D) and E)
G) C) and D)

Question 8

In general, Z is less than Zeff.

Accepted Answer

A) True 
 B)False

Question 9

Which element has the most unpaired electrons in its ground state?

Accepted Answer

A)   Mn
B)   Cu
C)   Ni
D)   CrE) A) and C)
F) A) and B)

Question 10

Write the electron configuration of Ni2+.

Accepted Answer

1s²2s²2p⁶3s²3p...

Question 11

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) A) and B)
G) C) and D)

Question 12

The number of orbitals having a given value of l is equal to

Accepted Answer

A)   the number of lobes in each orbital
B)   2n + 2
C)   3l
D)   l + ml
E)   2l + 1F) B) and C)
G) B) and D)

Question 13

Of the following elements, which has occupied d orbitals in its ground-state neutral atoms?

Accepted Answer

A)   Si
B)   Ba
C)   K
D)   O
E)   FF) All of the above
G) A) and C)

Question 14

For the set of elements C, N, O, and F, which element has the smallest ionization energy? Explain any deviation from the expected pattern.

Accepted Answer

O has the smallest i...

Question 15

Write the electron configuration for the following:
-Ca

Accepted Answer

1s²2s²2p⁶3s²3p...

Question 16

From the following list of observations, choose the one that most clearly supports the conclusion that electrons in atoms have quantized energies.

Accepted Answer

A)   the photoelectric effect
B)   the scattering of alpha particles by metal foil
C)   diffraction
D)   cathode "rays"
E)   the emission spectrum of hydrogenF) B) and E)
G) None of the above

Question 17

What is the electron configuration for the barium atom?

Accepted Answer

A)   1s22s22p63s23p64s2
B)   1s22s22p63s23p64s1
C)   1s22s22p63s23p63d104s2
D)   [Xe] 6s2
E)   none of theseF) A) and D)
G) A) and B)

Question 18

For an electron in a one-dimensional box, what is the minimum energy to excite the electron from the ground state?

Accepted Answer

A)   
B)   
C)   
D)   
E)   F) B) and D)
G) B) and C)

Question 19

Consider the following orderings.
I. Al + 2+ 3+ 4+
-Which of these give(s)  a correct trend in size?

Accepted Answer

A)   II only
B)   IV only
C)   II, IV
D)   III
E)   IF) A) and C)
G) None of the above

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] 4f146s25d106p2

Accepted Answer

The element is Pb wi...

Exam 12: Quantum Mechanics and Atomic Theory

An atom of nitrogen contains 7 electrons. How many of these electrons are in p orbitals?

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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?

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From the following list of observations, choose the one that most clearly supports the conclusion that electrons in atoms have quantized energies.

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

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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] 4f146s25d106p2

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

What is the electron configuration for the barium atom?

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The number of orbitals having a given value of l is equal to

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Consider the following portion of the energy-level diagram for hydrogen: -In the hydrogen spectrum, what is the wavelength of light associated with the n = 2 to n = 1 electron transition?

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For an electron in a one-dimensional box, what is the minimum energy to excite the electron from the ground state?

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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 these give(s) a correct trend in size?

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Write the electron configuration of Ni2+.

Correct Answerverified1s22s22p63s23p...View AnswerShow Answer

Which of the following statements about quantum theory is incorrect?

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Write the electron configuration for the following: -Ca

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what is the speed of the ejected electron? me = 9.11 x 10-31 kg

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What is the electron configuration of Cr3+?

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For the set of elements C, N, O, and F, which element has the smallest ionization energy? Explain any deviation from the expected pattern.

Correct AnswerverifiedO has the smallest i...View AnswerShow Answer

Of the following elements, which has occupied d orbitals in its ground-state neutral atoms?

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In general, Z is less than Zeff.

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In Bohr's atomic theory, when an electron moves from one energy level to another energy level more distant from the nucleus,

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Which element has the most unpaired electrons in its ground state?

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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?

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

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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] 4f¹⁴6s²5d¹⁰6p²

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The element is Pb wi...
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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 these give(s) a correct trend in size?

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Write the electron configuration of Ni²⁺.

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1s²2s²2p⁶3s²3p...
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1s²2s²2p⁶3s²3p...
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what is the speed of the ejected electron? m_e = 9.11 x 10^-31 kg

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What is the electron configuration of Cr³⁺?

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O has the smallest i...
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In general, Z is less than Z_eff.

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