Question 1

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?

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 m

Question 2

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 answer of Given the electron configurations of the following...

Question 3

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)  8

Question 4

What is the electron configuration for the barium atom?

Accepted Answer

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

Question 5

Consider the following orderings.
I. Al < Si < P < Cl
II. Be < Mg < Ca < Sr
III. I < Br < Cl < F
IV. NaS1U1P1+S1S1P0 < MgS1U1P12+S1S1P0 < AlS1U1P13+S1S1P0 < SiS1U1P14+S1S1P0
-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.

Question 6

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

The answer of For the set of elements C, N,...

Question 7

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 these

Question 8

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 + 1

Question 9

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.

Question 10

Write the electron configuration for the following:
-Ca

Accepted Answer

The answer of Write the electron configuration for the following:
-Ca...

Question 11

Consider the following orderings.
I. Al < Si < P < Cl
II. Be < Mg < Ca < Sr
III. I < Br < Cl < F
IV. NaS1U1P1+S1S1P0 < MgS1U1P12+S1S1P0 < AlS1U1P13+S1S1P0 < SiS1U1P14+S1S1P0
-Which of these give(s) a correct trend in size?

Accepted Answer

A)  II only 
B)  IV only 
C)  II, IV 
D)  III 
E)  I

Question 12

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 above

Question 13

What is the electron configuration of Cr3+?

Accepted Answer

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

Question 14

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)

Question 15

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

Accepted Answer

A)  Mn 
B)  Cu 
C)  Ni 
D)  Cr

Question 16

In general, Z is less than Zeff.

Accepted Answer

A) True 
 B)False

Question 17

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

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.

Question 18

Write the electron configuration of Ni²⁺.

Accepted Answer

The answer of Write the electron configuration of Ni²⁺....

Question 19

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)  F

Question 20

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 hydrogen

Exam 12: Quantum Mechanics and Atomic Theory

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?

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

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

What is the electron configuration for the barium atom?

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?

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

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

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

Which of the following statements about quantum theory is incorrect?

Write the electron configuration for the following: -Ca

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?

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

What is the electron configuration of Cr³⁺?

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

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

In general, Z is less than Z_eff.

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

Write the electron configuration of Ni²⁺.

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

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

Exam 12: Quantum Mechanics and Atomic Theory

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?

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

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

What is the electron configuration for the barium atom?

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?

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

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

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

Which of the following statements about quantum theory is incorrect?

Write the electron configuration for the following: -Ca

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?

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

What is the electron configuration of Cr3+?

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

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

In general, Z is less than Zeff.

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

Write the electron configuration of Ni2+.

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

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

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

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?

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?

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

What is the electron configuration of Cr³⁺?

In general, Z is less than Z_eff.

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

Write the electron configuration of Ni²⁺.