Question 1

Nitrogen has 5 valence electrons. Consider the following electron arrangements.

-Which represents the ground state for the N- ion?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 2

How many valence electrons do the alkaline earth metals have?

Accepted Answer

A)  8 
B)  2 
C)  7 
D)  3 
E)  1 
A)  8 
B)  2 
C)  7 
D)  3 
E)  1

Question 3

An electron in a 10.0-nm one-dimensional box is excited from the ground state into a higher energy state by absorbing a photon with wavelength 1.374 *10-5 m. Determine the final energy level for this transition.

Accepted Answer

A)  n = 6 
B)  n = 4 
C)  n = 2 
D)  n = 5 
E)  n = 3 
A)  n = 6 
B)  n = 4 
C)  n = 2 
D)  n = 5 
E)  n = 3

Question 4

An element E has the electron configuration [Ar]3d104s24p3. What is the formula for the fluoride of E most likely to be?

Accepted Answer

A)  EF6 
B)  EF8 
C)  EF3 
D)  EF 
E)  EF2 
A)  EF6 
B)  EF8 
C)  EF3 
D)  EF 
E)  EF2

Question 5

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

Question 6

For the set of elements Li, K, Ar, and Kr, which element has the largest atomic radius? Explain any deviation from the expected pattern.

Accepted Answer

K has the largest at

Question 7

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

Accepted Answer

A)  33 
B)  3 
C)  1 
D)  2 
E)  none of these 
A)  33 
B)  3 
C)  1 
D)  2 
E)  none of these

Question 8

For which of the following elements does the electron configuration for the lowest energy state show a partially filled d orbital?

Accepted Answer

A)  S 
B)  Ca 
C)  Rb 
D)  Kr 
E)  Ti 
A)  S 
B)  Ca 
C)  Rb 
D)  Kr 
E)  Ti

Question 9

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

Question 10

How many electrons can be described by the quantum numbers n = 4, l = 3, ml = -1, ms = -1?

Accepted Answer

A)  0 
B)  14 
C)  2 
D)  6 
E)  10 
A)  0 
B)  14 
C)  2 
D)  6 
E)  10

Question 11

Of the following elements, which needs 3 electrons to complete its valence shell?

Accepted Answer

A)  S 
B)  Ba 
C)  K 
D)  N 
E)  F 
A)  S 
B)  Ba 
C)  K 
D)  N 
E)  F

Question 12

Write the electron configuration for the following:
-Na

Accepted Answer

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

Question 13

What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from the n = 5 level to the n = 2 level?

Accepted Answer

A)  5.82 *10-7 m 
B)  6.50 * 10-7 m 
C)  4.34 *10-7 m 
D)  5.12*10-7 m 
E)  none of these 
A)  5.82 *10-7 m 
B)  6.50 * 10-7 m 
C)  4.34 *10-7 m 
D)  5.12*10-7 m 
E)  none of these

Question 14

The valence electron configuration of an element is ns2(n - 1)d10np2. To which group does X belong?

Accepted Answer

A)  Group 3A 
B)  Group 4A 
C)  Group 6A 
D)  Group 5A 
E)  Group 7A 
A)  Group 3A 
B)  Group 4A 
C)  Group 6A 
D)  Group 5A 
E)  Group 7A

Question 15

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

Accepted Answer

A)  2 
B)  3 
C)  17 
D)  1 
E)  none of these 
A)  2 
B)  3 
C)  17 
D)  1 
E)  none of these

Question 16

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?

Accepted Answer

A)  1 
B)  12 
C)  6 
D)  8 
E)  3 
A)  1 
B)  12 
C)  6 
D)  8 
E)  3

Question 17

For an electron in a 2.00-nm one-dimensional box, calculate the wavelength of electromagnetic radiation to excite the electron from the ground state to the level with n = 3.

Accepted Answer

A)  12,100 nm 
B)  1470 nm 
C)  13,200 nm 
D)  1650 nm 
E)  none of these 
A)  12,100 nm 
B)  1470 nm 
C)  13,200 nm 
D)  1650 nm 
E)  none of these

Question 18

How many unpaired electrons are there in an atom of sulfur in its ground state?

Accepted Answer

A)  1 
B)  2 
C)  4 
D)  0 
E)  3 
A)  1 
B)  2 
C)  4 
D)  0 
E)  3

Question 19

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 exhibits the correct orders (increasing) for atomic radius and ionization energy, respectively?

Accepted Answer

A)  F, S, O, and O, S, F 
B)  F, O, S, and S, O, F 
C)  S, O, F, and F, O, S 
D)  S, F, O, and S, F, O 
E)  none of these 
A)  F, S, O, and O, S, F 
B)  F, O, S, and S, O, F 
C)  S, O, F, and F, O, S 
D)  S, F, O, and S, F, O 
E)  none of these

Question 20

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

Accepted Answer

A)  6 
B)  25 
C)  10 
D)  5 
E)  3 
A)  6 
B)  25 
C)  10 
D)  5 
E)  3

Nitrogen has 5 valence electrons. Consider the following electron arrangements. -Which represents the ground state for the N^- ion?

How many valence electrons do the alkaline earth metals have?

An electron in a 10.0-nm one-dimensional box is excited from the ground state into a higher energy state by absorbing a photon with wavelength 1.374 *10^-⁵ m. Determine the final energy level for this transition.

An element E has the electron configuration [Ar]3d¹⁰4s²4p³. What is the formula for the fluoride of E most likely to be?

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.)

For the set of elements Li, K, Ar, and Kr, which element has the largest atomic radius? Explain any deviation from the expected pattern.

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

For which of the following elements does the electron configuration for the lowest energy state show a partially filled d orbital?

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.

How many electrons can be described by the quantum numbers n = 4, l = 3, m_l = -1, m_s = -1?

Of the following elements, which needs 3 electrons to complete its valence shell?

Write the electron configuration for the following: -Na

What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from the n = 5 level to the n = 2 level?

The valence electron configuration of an element is ns²(n - 1)d¹⁰np². To which group does X belong?

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

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

For an electron in a 2.00-nm one-dimensional box, calculate the wavelength of electromagnetic radiation to excite the electron from the ground state to the level with n = 3.

How many unpaired electrons are there in an atom of sulfur in its ground state?

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 exhibits the correct orders (increasing) for atomic radius and ionization energy, respectively?

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

Atoms, Molecules, and Ions

Stoichiometry

Chemical Reactions and Solutions Stoichiometry

Gases

Chemical Equilibrium

Acids and Bases

Applications of Aqueous Equilibria

Energy, Enthalpy, and Thermochemistry

Spontaneity, Entropy, and Free Energy

Electrochemistry

Bonding: General Concepts

Covalent Bonding: Orbitals

Chemical Kinetics

Liquids and Solids

Properties of Solutions

The Representative Elements

Transition Metals and Coordination Chemistry

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Filters

Exam 12: Quantum Mechanics and Atomic Theory

Nitrogen has 5 valence electrons. Consider the following electron arrangements. -Which represents the ground state for the N- ion?

How many valence electrons do the alkaline earth metals have?

An electron in a 10.0-nm one-dimensional box is excited from the ground state into a higher energy state by absorbing a photon with wavelength 1.374 *10-5 m. Determine the final energy level for this transition.

An element E has the electron configuration [Ar]3d104s24p3. What is the formula for the fluoride of E most likely to be?

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.)

For the set of elements Li, K, Ar, and Kr, which element has the largest atomic radius? Explain any deviation from the expected pattern.

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

For which of the following elements does the electron configuration for the lowest energy state show a partially filled d orbital?

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.

How many electrons can be described by the quantum numbers n = 4, l = 3, ml = -1, ms = -1?

Of the following elements, which needs 3 electrons to complete its valence shell?

Write the electron configuration for the following: -Na

What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from the n = 5 level to the n = 2 level?

The valence electron configuration of an element is ns2(n - 1)d10np2. To which group does X belong?

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

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?

For an electron in a 2.00-nm one-dimensional box, calculate the wavelength of electromagnetic radiation to excite the electron from the ground state to the level with n = 3.

How many unpaired electrons are there in an atom of sulfur in its ground state?

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 exhibits the correct orders (increasing) for atomic radius and ionization energy, respectively?

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

Atoms, Molecules, and Ions

Stoichiometry

Chemical Reactions and Solutions Stoichiometry

Gases

Chemical Equilibrium

Acids and Bases

Applications of Aqueous Equilibria

Energy, Enthalpy, and Thermochemistry

Spontaneity, Entropy, and Free Energy

Electrochemistry

Bonding: General Concepts

Covalent Bonding: Orbitals

Chemical Kinetics

Liquids and Solids

Properties of Solutions

The Representative Elements

Transition Metals and Coordination Chemistry

The Nucleus: a Chemists View

Organic and Biochemical Molecules

Filters

Nitrogen has 5 valence electrons. Consider the following electron arrangements. -Which represents the ground state for the N^- ion?

An electron in a 10.0-nm one-dimensional box is excited from the ground state into a higher energy state by absorbing a photon with wavelength 1.374 *10^-⁵ m. Determine the final energy level for this transition.

An element E has the electron configuration [Ar]3d¹⁰4s²4p³. What is the formula for the fluoride of E most likely to be?

How many electrons can be described by the quantum numbers n = 4, l = 3, m_l = -1, m_s = -1?

The valence electron configuration of an element is ns²(n - 1)d¹⁰np². To which group does X belong?

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

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 exhibits the correct orders (increasing) for atomic radius and ionization energy, respectively?