Question 1

From the following list of observations, choose the one that most clearly supports the conclusion of de Broglie wavelengths.

Accepted Answer

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

Question 2

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

Accepted Answer

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

Question 3

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 4

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 
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 5

The first ionization energy of Mg is 735 kJ/mol. Calculate Zeff.

Accepted Answer

A)  2.25 
B)  2.00 
C)  4.00 
D)  5.04 
E)  none of these 
A)  2.25 
B)  2.00 
C)  4.00 
D)  5.04 
E)  none of these

Question 6

Four electrons are confined to a one-dimensional box 5.64 × 10-10 m long. If two electrons can occupy each allowed energy level, calculate the wavelength of electromagnetic radiation necessary to promote the highest-energy electron into the first excited state.

Accepted Answer

Question 7

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 8

Which of the following statements is true?

Accepted Answer

A)  We can determine the exact location of an electron if we know its energy. 
B)  Ni has 2 unpaired electrons in its 3d orbitals. 
C)  An electron in a 2s orbital can have the same n, l, and ml quantum numbers as an electron in a 3s orbital. 
D)  Only three quantum numbers are needed to uniquely describe an electron. 
E)  In the building up of atoms, electrons occupy the 4f orbitals before the 6s orbitals. 
A)  We can determine the exact location of an electron if we know its energy. 
B)  Ni has 2 unpaired electrons in its 3d orbitals. 
C)  An electron in a 2s orbital can have the same n, l, and ml quantum numbers as an electron in a 3s orbital. 
D)  Only three quantum numbers are needed to uniquely describe an electron. 
E)  In the building up of atoms, electrons occupy the 4f orbitals before the 6s orbitals.

Question 9

Consider the following portion of the energy-level diagram for hydrogen:  
-The wavelength of light associated with the n = 2 to n = 1 electron transition in the hydrogen spectrum is 1.216 × 10-7 m. By what coefficient should this wavelength be multiplied to obtain the wavelength associated with the same electron transition in the Li2+ ion?

Accepted Answer

A)  1 
B)  1/3 
C)  1/4 
D)  1/7 
E)  1/9 
A)  1 
B)  1/3 
C)  1/4 
D)  1/7 
E)  1/9

Question 10

Which of the following frequencies corresponds to light with the longest wavelength?

Accepted Answer

A)  9.12 × 1012 s-1 
B)  3.20 × 109 s-1 
C)  8.50 × 1020 s-1 
D)  3.00 × 1013 s-1 
E)  4.12 × 105 s-1 
A)  9.12 × 1012 s-1 
B)  3.20 × 109 s-1 
C)  8.50 × 1020 s-1 
D)  3.00 × 1013 s-1 
E)  4.12 × 105 s-1

Question 11

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 
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 12

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 13

Write the electron configuration of Ni2+.

Accepted Answer

1s²2s²2p⁶3s²3p

Question 14

What is the electron configuration for the barium atom?

Accepted Answer

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

Question 15

The _____ states that in a given atom no two electrons can have the same set of four quantum numbers (n, l, ml, ms).

Accepted Answer

A)  ​Pauli exclusion principle 
B)  ​Huygens-Fresnel principle 
C)  ​Cauchy's argument principle 
D)  ​Heisenberg uncertainty principle 
E)  ​Le Chatelier's principle 
A)  ​Pauli exclusion principle 
B)  ​Huygens-Fresnel principle 
C)  ​Cauchy's argument principle 
D)  ​Heisenberg uncertainty principle 
E)  ​Le Chatelier's principle

Question 16

Which statements about hydrogen are true?
I. H has a lower ionization energy than He.
II. H- is smaller than H.
III. H has a higher effective nuclear charge than He.
IV. H is always a metal.V. H does not have a second ionization energy.

Accepted Answer

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

Question 17

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

Question 18

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 19

In which orbital does an electron experience the highest Zeff?

Accepted Answer

A)  P (3p) 
B)  Na (3s) 
C)  Al (3p) 
D)  Mg (3s) 
E)  S (3p) 
A)  P (3p) 
B)  Na (3s) 
C)  Al (3p) 
D)  Mg (3s) 
E)  S (3p)

Question 20

Which of the following statements is true about the ionization energy of Mg+?

Accepted Answer

A)  It will be equal to and opposite in sign to the electron affinity of Mg. 
B)  It will be equal to and opposite in sign to the electron affinity of Mg+. 
C)  It will be equal to the ionization energy of Li. 
D)  It will be equal to and opposite in sign to the electron affinity of Mg2+. 
E)  none of the above 
A)  It will be equal to and opposite in sign to the electron affinity of Mg. 
B)  It will be equal to and opposite in sign to the electron affinity of Mg+. 
C)  It will be equal to the ionization energy of Li. 
D)  It will be equal to and opposite in sign to the electron affinity of Mg2+. 
E)  none of the above

From the following list of observations, choose the one that most clearly supports the conclusion of de Broglie wavelengths.

Which element has the most unpaired electrons 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?

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?

The first ionization energy of Mg is 735 kJ/mol. Calculate Z_eff.

Four electrons are confined to a one-dimensional box 5.64 × 10^-10 m long. If two electrons can occupy each allowed energy level, calculate the wavelength of electromagnetic radiation necessary to promote the highest-energy electron into the first excited state.

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?

Which of the following statements is true?

Which of the following frequencies corresponds to light with the longest wavelength?

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

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.

Write the electron configuration of Ni²⁺.

What is the electron configuration for the barium atom?

The _____ states that in a given atom no two electrons can have the same set of four quantum numbers (n, l, m_l, m_s).

Which statements about hydrogen are true? I. H has a lower ionization energy than He. II. H^- is smaller than H. III. H has a higher effective nuclear charge than He. IV. H is always a metal.V. H does not have a second ionization energy.

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?

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

In which orbital does an electron experience the highest Z_eff?

Which of the following statements is true about the ionization energy of Mg⁺?

Atoms, Molecules, and Ions

Stoichiometry

Types of Chemical Reactions and Solution 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

Exam 12: Quantum Mechanics and Atomic Theory

From the following list of observations, choose the one that most clearly supports the conclusion of de Broglie wavelengths.

Which element has the most unpaired electrons 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?

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?

The first ionization energy of Mg is 735 kJ/mol. Calculate Zeff.

Four electrons are confined to a one-dimensional box 5.64 × 10-10 m long. If two electrons can occupy each allowed energy level, calculate the wavelength of electromagnetic radiation necessary to promote the highest-energy electron into the first excited state.

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?

Which of the following statements is true?

Which of the following frequencies corresponds to light with the longest wavelength?

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

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.

Write the electron configuration of Ni2+.

What is the electron configuration for the barium atom?

The _____ states that in a given atom no two electrons can have the same set of four quantum numbers (n, l, ml, ms).

Which statements about hydrogen are true? I. H has a lower ionization energy than He. II. H- is smaller than H. III. H has a higher effective nuclear charge than He. IV. H is always a metal.V. H does not have a second ionization energy.

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?

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

In which orbital does an electron experience the highest Zeff?

Which of the following statements is true about the ionization energy of Mg+?

Atoms, Molecules, and Ions

Stoichiometry

Types of Chemical Reactions and Solution 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

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?

The first ionization energy of Mg is 735 kJ/mol. Calculate Z_eff.

Four electrons are confined to a one-dimensional box 5.64 × 10^-10 m long. If two electrons can occupy each allowed energy level, calculate the wavelength of electromagnetic radiation necessary to promote the highest-energy electron into the first excited state.

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

Write the electron configuration of Ni²⁺.

The _____ states that in a given atom no two electrons can have the same set of four quantum numbers (n, l, m_l, m_s).

Which statements about hydrogen are true? I. H has a lower ionization energy than He. II. H^- is smaller than H. III. H has a higher effective nuclear charge than He. IV. H is always a metal.V. H does not have a second ionization energy.

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?

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

In which orbital does an electron experience the highest Z_eff?

Which of the following statements is true about the ionization energy of Mg⁺?