Question 1

The emission spectra of Na and Na+ are different because ________

Accepted Answer

A)  Na+ has fewer electrons. 
B)  Na has fewer electrons. 
C)  Na+ has more protons. 
D)  Na has fewer neutrons. 
E)  Na has more protons. 
A)  Na+ has fewer electrons. 
B)  Na has fewer electrons. 
C)  Na+ has more protons. 
D)  Na has fewer neutrons. 
E)  Na has more protons.

Question 2

How many orbitals that have the principal quantum number equal to 3 are there in an atom?

Accepted Answer

A)  2 
B)  4 
C)  9 
D)  16 
E)  18 
A)  2 
B)  4 
C)  9 
D)  16 
E)  18

Question 3

Which of the following electron configurations represents an excited state?

Accepted Answer

A)  [Ne]3s23p5 
B)  [Kr]4d105s25p1 
C)  [Ar]3d104s24p6 
D)  [Ne]3s23p64s1 
E)  [Kr]4d105s15p1 
A)  [Ne]3s23p5 
B)  [Kr]4d105s25p1 
C)  [Ar]3d104s24p6 
D)  [Ne]3s23p64s1 
E)  [Kr]4d105s15p1

Question 4

What color will a yellow object appear when it is seen through a filter with the absorption spectrum shown below?

Accepted Answer

A)  blue 
B)  yellow 
C)  red 
D)  black 
E)  white 
A)  blue 
B)  yellow 
C)  red 
D)  black 
E)  white

Question 5

What is the orbital designation for an electron with the quantum numbers n = 3, $\ell$ = 2?

Accepted Answer

A)  3s 
B)  3d 
C)  2p 
D)  2f 
E)  3e 
A)  3s 
B)  3d 
C)  2p 
D)  2f 
E)  3e

Question 6

Astronomers have detected hydrogen atoms in interstellar space in the n = 732 energy level. Suppose an atom in this excited state emits a photon and undergoes a transition from n = 732 to n = 632. How much energy does the atom lose as a result of this transition? What is the frequency of this radiation? In which spectral region does this radiation lie?

Accepted Answer

1.39 *10^-²⁴ J of energy was lost.

Question 7

Which of the following is the ground-state electron configuration of the Mg2+ ion?

Accepted Answer

A)  1s22s22p63s2 
B)  [Ne]3s2 
C)  [Ne]3s23p2 
D)  [He]2s22p6 
E)  [He]2s22p8 
A)  1s22s22p63s2 
B)  [Ne]3s2 
C)  [Ne]3s23p2 
D)  [He]2s22p6 
E)  [He]2s22p8

Question 8

Which of the following occurs only in discrete (quantized) increments?

Accepted Answer

A)  the speed a car drives on the interstate 
B)  the altitude that an airplane flies 
C)  time 
D)  the level of water in a sink 
E)  money 
A)  the speed a car drives on the interstate 
B)  the altitude that an airplane flies 
C)  time 
D)  the level of water in a sink 
E)  money

Question 9

Arrange the following elements in order of increasing first ionization energy:
3Li, 9F, 12Mg, 15P, 17Cl.

Accepted Answer

Li < Mg <

Question 10

The size of a typical atomic orbital is on the order of ________

Accepted Answer

A)  femtometers. 
B)  picometers. 
C)  nanometers. 
D)  micrometers. 
E)  millimeters. 
A)  femtometers. 
B)  picometers. 
C)  nanometers. 
D)  micrometers. 
E)  millimeters.

Question 11

Which transition metal ion has no d electrons?

Accepted Answer

A)  Ti2+ 
B)  Fe3+ 
C)  Cr3+ 
D)  Mn7+ 
E)  Cu2+ 
A)  Ti2+ 
B)  Fe3+ 
C)  Cr3+ 
D)  Mn7+ 
E)  Cu2+

Question 12

Which monatomic ion most likely does not exist?

Accepted Answer

A)  Al2+ 
B)  Mg2+ 
C)  Cs+ 
D)  S2- 
E)  I- 
A)  Al2+ 
B)  Mg2+ 
C)  Cs+ 
D)  S2- 
E)  I-

Question 13

The atomic radius of germanium (Z = 32) is smaller than the atomic radius of potassium (Z = 19) because of ________

Accepted Answer

A)  a change in the n quantum number. 
B)  an increase in the effective nuclear charge. 
C)  the fact that p and d orbitals have the same orbital penetration. 
D)  a decrease in the effective nuclear charge. 
E)  germanium having 32 rather than 19 electrons. 
A)  a change in the n quantum number. 
B)  an increase in the effective nuclear charge. 
C)  the fact that p and d orbitals have the same orbital penetration. 
D)  a decrease in the effective nuclear charge. 
E)  germanium having 32 rather than 19 electrons.

Question 14

Across a row in the periodic table, the ionization energy ________

Accepted Answer

A)  increases because the n quantum number changes. 
B)  increases because the $\ell$ quantum number changes. 
C)  decreases because the effective nuclear charge decreases. 
D)  increases because the effective nuclear charge increases. 
E)  changes little because the outer electrons all are in the same shell. 
A)  increases because the n quantum number changes. 
B)  increases because the $\ell$ quantum number changes. 
C)  decreases because the effective nuclear charge decreases. 
D)  increases because the effective nuclear charge increases. 
E)  changes little because the outer electrons all are in the same shell.

Question 15

Which statement A-D about the wave function for a single electron is not correct?

Accepted Answer

A)  A French graduate student named Louis de Broglie first had the idea that an electron should be described as a wave. 
B)  Since  = c, an expression for the wavelength of an electron can be found by combining Einstein's equation that relates mass and energy (E = mc2) with his equation that gives the energy of a photon in terms of its frequency (E =  ). 
C)  The square of the wave function's amplitude at a particular point in space gives the probability density of finding the electron at that point. 
D)  Wave functions can have nodes, which are points where the amplitude is zero. 
E)  Statements A-D are all correct. 
A)  A French graduate student named Louis de Broglie first had the idea that an electron should be described as a wave. 
B)  Since  = c, an expression for the wavelength of an electron can be found by combining Einstein's equation that relates mass and energy (E = mc2) with his equation that gives the energy of a photon in terms of its frequency (E =  ). 
C)  The square of the wave function's amplitude at a particular point in space gives the probability density of finding the electron at that point. 
D)  Wave functions can have nodes, which are points where the amplitude is zero. 
E)  Statements A-D are all correct.

Question 16

If the principal quantum number is seven (n = 7) and the angular momentum quantum number is three ( $\ell$ = 3), which of the following values is not an allowed value of the magnetic quantum number (ml)?

Accepted Answer

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

Question 17

An atom in its ground state absorbs a single photon of light and then relaxes back to the ground state by emitting an infrared photon (1,200 nm) followed by an orange photon (600 nm). What is the wavelength of the photon that was absorbed initially?

Accepted Answer

A)  600 nm 
B)  1,200 nm 
C)  1,800 nm 
D)  900 nm 
E)  400 nm 
A)  600 nm 
B)  1,200 nm 
C)  1,800 nm 
D)  900 nm 
E)  400 nm

Question 18

How many orbitals exist for the quantum numbers n = 4, $\ell$ = 1?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  7 
A)  1 
B)  2 
C)  3 
D)  4 
E)  7

Question 19

Which listing has the orbitals in order of increasing energy in a multielectron atom?

Accepted Answer

A)  3s x y z 
E)  2s < 3s < 2p < 3d 
A)  3s x y z 
E)  2s < 3s < 2p < 3d

Question 20

Which of the following photons has the highest energy?

Accepted Answer

A)  a photon from a Nd:YAG laser with $\lambda$= 1,064 nm 
B)  a photon from an Ar+ laser with $\lambda$ = 514.5 nm 
C)  a photon from a Kr+ laser with $\lambda$ = 647 nm 
D)  a photon from an ArF laser with $\lambda$ = 193 nm 
E)  a photon from a He-Ne laser with $\lambda$ = 633 nm 
A)  a photon from a Nd:YAG laser with $\lambda$= 1,064 nm 
B)  a photon from an Ar+ laser with $\lambda$ = 514.5 nm 
C)  a photon from a Kr+ laser with $\lambda$ = 647 nm 
D)  a photon from an ArF laser with $\lambda$ = 193 nm 
E)  a photon from a He-Ne laser with $\lambda$ = 633 nm

Exam 7: A Quantum Model of Atoms: Waves and Particles

The emission spectra of Na and Na+ are different because ________

How many orbitals that have the principal quantum number equal to 3 are there in an atom?

Which of the following electron configurations represents an excited state?

What color will a yellow object appear when it is seen through a filter with the absorption spectrum shown below?

What is the orbital designation for an electron with the quantum numbers n = 3, ℓ\ellℓ = 2?

Which of the following is the ground-state electron configuration of the Mg2+ ion?

Which of the following occurs only in discrete (quantized) increments?

Arrange the following elements in order of increasing first ionization energy: 3Li, 9F, 12Mg, 15P, 17Cl.

The size of a typical atomic orbital is on the order of ________

Which transition metal ion has no d electrons?

Which monatomic ion most likely does not exist?

The atomic radius of germanium (Z = 32) is smaller than the atomic radius of potassium (Z = 19) because of ________

Across a row in the periodic table, the ionization energy ________

Which statement A-D about the wave function for a single electron is not correct?

If the principal quantum number is seven (n = 7) and the angular momentum quantum number is three ( ℓ\ellℓ = 3), which of the following values is not an allowed value of the magnetic quantum number (ml)?

An atom in its ground state absorbs a single photon of light and then relaxes back to the ground state by emitting an infrared photon (1,200 nm) followed by an orange photon (600 nm). What is the wavelength of the photon that was absorbed initially?

How many orbitals exist for the quantum numbers n = 4, ℓ\ellℓ = 1?

Which listing has the orbitals in order of increasing energy in a multielectron atom?

Which of the following photons has the highest energy?

Matter and Energy: The Origin of the Universe

Atoms, Ions, and Molecules: Matter Starts Here

Stoichiometry: Mass, Formulas, and Reactions

Solution Chemistry: The Hydrosphere

Thermochemistry: Energy Changes in Reactions

Properties of Gases: the Air We Breathe

Chemical Bonds: What Makes a Gas a Greenhouse Gas

Molecular Geometry: Shape Determines Function

Intermolecular Forces: The Uniqueness of Water

Solutions: Properties and Behavior

Solids: Structures and Applications

Organic Chemistry: Fuels, Pharmaceuticals, Materials, and Life

Chemical Kinetics: Reactions in the Air We Breathe

Chemical Equilibrium: How Much Product Does a Reaction Really Make

Acid-Base and Solubility Equilibria: Reactions in Soil and Water

Metal Ions: Colorful and Essential

Thermodynamics: Spontaneous and Nonspontaneous Reactions and Processes

Electrochemistry: the Quest for Clean Energy

Biochemistry: the Compounds of Life

Nuclear Chemistry: Applications to Energy and Medicine

Life and the Periodic Table

Filters

The emission spectra of Na and Na⁺ are different because ________

What is the orbital designation for an electron with the quantum numbers n = 3, $\ell$ = 2?

Which of the following is the ground-state electron configuration of the Mg²⁺ ion?

Arrange the following elements in order of increasing first ionization energy: ₃Li, ₉F, ₁₂Mg, ₁₅P, ₁₇Cl.

If the principal quantum number is seven (n = 7) and the angular momentum quantum number is three ( $\ell$ = 3), which of the following values is not an allowed value of the magnetic quantum number (m_l)?

How many orbitals exist for the quantum numbers n = 4, $\ell$ = 1?