Question 1

There are unpaired electrons in a ground state phosphorus atom.

Accepted Answer

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

Question 2

Electromagnetic radiation travels through vacuum at a speed of _ m/s.

Accepted Answer

A)  186,000 
B)  3.00 × 108 
C)  10,000 
D)  125 
E)  It depends on wavelength. 
A)  186,000 
B)  3.00 × 108 
C)  10,000 
D)  125 
E)  It depends on wavelength.

Question 3

The ground state electron configuration of scandium is .

Accepted Answer

The answer of The ground state electron configuration of scandium...

Question 4

Of the following transitions in the Bohr hydrogen atom, the transition results in the emission of the highest- energy photon.

Accepted Answer

A)  n = 6 -n = 3 
B)  n = 1 -n = 6 
C)  n = 3 -n = 6 
D)  n = 6 -n = 1 
E)  n = 1 -n = 4 
A)  n = 6 -n = 3 
B)  n = 1 -n = 6 
C)  n = 3 -n = 6 
D)  n = 6 -n = 1 
E)  n = 1 -n = 4

Question 5

Calculate the energy (J) change associated with an electron transition from n = 2 to n = 5 in a Bohr hydrogen atom .

Accepted Answer

A)  6.5 × 10- 19 
B)  8.7 × 10- 20 
C)  4.6 × 10- 19 
D)  5.5 × 10- 19 
E)  5.8 × 10- 53 
A)  6.5 × 10- 19 
B)  8.7 × 10- 20 
C)  4.6 × 10- 19 
D)  5.5 × 10- 19 
E)  5.8 × 10- 53

Question 6

What wavelengths correspond to the visible region of the electromagnetic spectrum?

Accepted Answer

About 400

Question 7

What is the de Broglie wavelength (m) of a 2.0 kg object moving at a speed of 50 m/s ?

Accepted Answer

A)  3.8 × 1034 
B)  5.3 × 10- 33 
C)  2.6 × 10- 35 
D)  6.6 × 10- 36 
E)  1.5 × 1035 
A)  3.8 × 1034 
B)  5.3 × 10- 33 
C)  2.6 × 10- 35 
D)  6.6 × 10- 36 
E)  1.5 × 1035

Question 8

Which quantum number determines the energy of an electron in a hydrogen atom?

Accepted Answer

A)  ml  
B)  n 
C)  E 
D)  l 
E)  n and l 
A)  ml  
B)  n 
C)  E 
D)  l 
E)  n and l

Question 9

Which one of the following is not a valid value for the magnetic quantum number of an electron in a 5d subshell?

Accepted Answer

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

Question 10

What is the frequency (s- 1) of electromagnetic radiation that has a wavelength of 0.53 m
?

Accepted Answer

A)  1.6 × 108 
B)  1.3 × 1033 
C)  5.7 × 108 
D)  1.8 × 10- 9 
E)  1.3 × 10- 33 
A)  1.6 × 108 
B)  1.3 × 1033 
C)  5.7 × 108 
D)  1.8 × 10- 9 
E)  1.3 × 10- 33

Question 11

Elements in group have a np6 electron configuration in the outer shell.

Accepted Answer

A)  7A 
B)  6A 
C)  5A 
D)  4A 
E)  8A 
A)  7A 
B)  6A 
C)  5A 
D)  4A 
E)  8A

Question 12

The uncertainty principle states that _.

Accepted Answer

A)  it is impossible to know how many electrons there are in an atom 
B)  it is impossible to know the exact position and momentum of an electron 
C)  it is impossible to know anything with certainty 
D)  matter and energy are really the same thing 
E)  there can only be one uncertain digit in a reported number 
A)  it is impossible to know how many electrons there are in an atom 
B)  it is impossible to know the exact position and momentum of an electron 
C)  it is impossible to know anything with certainty 
D)  matter and energy are really the same thing 
E)  there can only be one uncertain digit in a reported number

Question 13

At what speed (m/s) must a 3.0 mg object be moving in order to have a de Broglie wavelength of 5.4
× 10- 29 m?

Accepted Answer

A)  4.1 
B)  3.9 × 10- 4 
C)  1.6 × 10- 28 
D)  2.0 × 1012 
E)  6.3 
A)  4.1 
B)  3.9 × 10- 4 
C)  1.6 × 10- 28 
D)  2.0 × 1012 
E)  6.3

Question 14

Which quantum numbers must be the same for the orbitals that they designate to be degenerate in a one- electron system (such as hydrogen)?

Accepted Answer

A)  n, l, and ml 
B)  l and ml 
C)  n only 
D)  ml only 
E)  n and l only 
A)  n, l, and ml 
B)  l and ml 
C)  n only 
D)  ml only 
E)  n and l only

Question 15

In which orbital does an electron in a phosphorus atom experience the greatest shielding
__________ ?

Accepted Answer

A)  3p 
B)  2p 
C)  1s 
D)  2s 
E)  3s 
A)  3p 
B)  2p 
C)  1s 
D)  2s 
E)  3s

Question 16

The deBroglie wavelength of a particle is given by .

Accepted Answer

A)  h/mv 
B)  h + mv 
C)  mv 
D)  mv/c 
E)  hmv 
A)  h/mv 
B)  h + mv 
C)  mv 
D)  mv/c 
E)  hmv

Question 17

It takes 254 kJ/mol to eject electrons from a certain metal surface. What is the longest wavelength of light (nm) that can be used to eject electrons from the surface of this metal via the photoelectric effect _ _ ?

Accepted Answer

A)  233 
B)  472 
C)  165 
D)  552 
E)  725 
A)  233 
B)  472 
C)  165 
D)  552 
E)  725

Question 18

Low- frequency electromagnetic fields with potential biological effects have frequencies of
Hz)

Accepted Answer

A)  400- 700 
B)  10- 3- 10- 5 
C)  1- 1000 
D)  10- 5- 10- 9 
E)  100- 10,000 
A)  400- 700 
B)  10- 3- 10- 5 
C)  1- 1000 
D)  10- 5- 10- 9 
E)  100- 10,000

Question 19

Which one of the quantum numbers does not result from the solution of the Schroedinger equation?

Accepted Answer

A)  angular momentum 
B)  principal 
C)  spin 
D)  azimuthal 
E)  magnetic 
A)  angular momentum 
B)  principal 
C)  spin 
D)  azimuthal 
E)  magnetic

Question 20

An electron cannot have the quantum numbers n = , l = , ml = .

Accepted Answer

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

Exam 6: Electronic Structure of Atoms

There are unpaired electrons in a ground state phosphorus atom.

Electromagnetic radiation travels through vacuum at a speed of _ m/s.

The ground state electron configuration of scandium is .

Of the following transitions in the Bohr hydrogen atom, the transition results in the emission of the highest- energy photon.

Calculate the energy (J) change associated with an electron transition from n = 2 to n = 5 in a Bohr hydrogen atom .

What wavelengths correspond to the visible region of the electromagnetic spectrum?

What is the de Broglie wavelength (m) of a 2.0 kg object moving at a speed of 50 m/s ?

Which quantum number determines the energy of an electron in a hydrogen atom?

Which one of the following is not a valid value for the magnetic quantum number of an electron in a 5d subshell?

What is the frequency (s- 1) of electromagnetic radiation that has a wavelength of 0.53 m ?

Elements in group have a np6 electron configuration in the outer shell.

The uncertainty principle states that _.

At what speed (m/s) must a 3.0 mg object be moving in order to have a de Broglie wavelength of 5.4 × 10- 29 m?

Which quantum numbers must be the same for the orbitals that they designate to be degenerate in a one- electron system (such as hydrogen)?

In which orbital does an electron in a phosphorus atom experience the greatest shielding __________ ?

The deBroglie wavelength of a particle is given by .

It takes 254 kJ/mol to eject electrons from a certain metal surface. What is the longest wavelength of light (nm) that can be used to eject electrons from the surface of this metal via the photoelectric effect _ _ ?

Low- frequency electromagnetic fields with potential biological effects have frequencies of Hz)

Which one of the quantum numbers does not result from the solution of the Schroedinger equation?

An electron cannot have the quantum numbers n = , l = , ml = .

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

What is the frequency (s^-¹) of electromagnetic radiation that has a wavelength of 0.53 m ?

Elements in group have a np⁶electron configuration in the outer shell.

At what speed (m/s) must a 3.0 mg object be moving in order to have a de Broglie wavelength of 5.4 × 10^-²⁹m?

An electron cannot have the quantum numbers n = , l = , m_l= .