Question 1

An element has the electron configuration [Kr] 4d105s25p2. The element is a(n)

Accepted Answer

A)  actinide. 
B)  metal. 
C)  transition element. 
D)  lanthanide. 
E)  nonmetal. 
A)  actinide. 
B)  metal. 
C)  transition element. 
D)  lanthanide. 
E)  nonmetal. B

Question 2

​Identify the true statement(s) of potassium's electronic configuration.
1. Potassium atom in the lowest-energy state has its last electron in the 4s orbital.
2. Potassium atom in the lowest-energy state has its last electron in the 3d orbital.
3. The electronic configuration of potassium is 1s22s22p63s23p63d1.

Accepted Answer

A)  ​1 only 
B)  ​2 only 
C)  ​3 only 
D)  ​1 and 3 
E)  ​2 and 3 
A)  ​1 only 
B)  ​2 only 
C)  ​3 only 
D)  ​1 and 3 
E)  ​2 and 3 A

Question 3

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

Question 4

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 
A)  energy is emitted. 
B)  energy is absorbed. 
C)  light is emitted. 
D)  no change in energy occurs. 
E)  none of these

Question 5

From the following list of observations, choose the one that most clearly supports the conclusion that electrons have wave properties.

Accepted Answer

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

Question 6

Which of the following atoms or ions has 3 unpaired electrons?

Accepted Answer

A)  Br- 
B)  Ga 
C)  S 
D)  Co 
E)  Zn2+ 
A)  Br- 
B)  Ga 
C)  S 
D)  Co 
E)  Zn2+

Question 7

For which element are the d orbitals completely filled in the neutral atom?

Accepted Answer

A)  bromine 
B)  phosphorus 
C)  potassium 
D)  vanadium 
E)  iron 
A)  bromine 
B)  phosphorus 
C)  potassium 
D)  vanadium 
E)  iron

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 
A)  the number of lobes in each orbital 
B)  2n + 2 
C)  3l 
D)  l + ml 
E)  2l + 1

Question 9

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state.
-[Kr] 4d105s25p1

Accepted Answer

The element is In wi

Question 10

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

Accepted Answer

A)  Si 
B)  Ca 
C)  Na 
D)  As 
E)  Br 
A)  Si 
B)  Ca 
C)  Na 
D)  As 
E)  Br

Question 11

what will be the kinetic energy of the ejected electrons? h = 6.626 x 10-34J.s, c = 2.998 x 108 m/s

Accepted Answer

A)  1.75 x 10-19 J 
B)  1.01 x 10-18 J 
C)  8.39 x 10-19 J 
D)  6.64 x 10-19 J 
E)  none of the above 
A)  1.75 x 10-19 J 
B)  1.01 x 10-18 J 
C)  8.39 x 10-19 J 
D)  6.64 x 10-19 J 
E)  none of the above

Question 12

Consider the following portion of the energy-level diagram for hydrogen:  
-On a planet where the temperature is so high, the ground state of an electron in the hydrogen atom is n = 4. What is the ratio of IE on this planet to that on earth?

Accepted Answer

A)  1:16 
B)  1:4 
C)  4:1 
D)  16:1 
E)  1:1 
A)  1:16 
B)  1:4 
C)  4:1 
D)  16:1 
E)  1:1

Question 13

Which atomic species, in its ground state, has six unpaired electrons?

Accepted Answer

A)  O 
B)  Fe 
C)  Cs 
D)  Dy 
E)  Mo 
A)  O 
B)  Fe 
C)  Cs 
D)  Dy 
E)  Mo

Question 14

Which of the following statements is false?

Accepted Answer

A)  In the usual order of filling, the 6s orbital is filled before the 4f orbital. 
B)  An orbital can accommodate at most two electrons. 
C)  The spin quantum number of an electron must be either +1/2 or -1/2. 
D)  A 2p orbital is more penetrating than a 2s; that is, it has a higher electron density near the nucleus and inside the charge cloud of a 1s orbital. 
E)  The electron density at a point is proportional to ψ2 at that point. 
A)  In the usual order of filling, the 6s orbital is filled before the 4f orbital. 
B)  An orbital can accommodate at most two electrons. 
C)  The spin quantum number of an electron must be either +1/2 or -1/2. 
D)  A 2p orbital is more penetrating than a 2s; that is, it has a higher electron density near the nucleus and inside the charge cloud of a 1s orbital. 
E)  The electron density at a point is proportional to ψ2 at that point.

Question 15

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state.
-1s22s22p5

Accepted Answer

The element is F wit

Question 16

What is the electron configuration of indium?

Accepted Answer

A)  1s22s22p63s23p63d104s24d104p1 
B)  1s22s22p63s23p63d104s24p64d105s25p15d10 
C)  1s23s22p63s23p64s24p64d105s25d105p1 
D)  1s22s22p63s23p63d104s24p64d105s25p1 
E)  none of these 
A)  1s22s22p63s23p63d104s24d104p1 
B)  1s22s22p63s23p63d104s24p64d105s25p15d10 
C)  1s23s22p63s23p64s24p64d105s25d105p1 
D)  1s22s22p63s23p63d104s24p64d105s25p1 
E)  none of these

Question 17

Which of the following combinations of quantum numbers is not allowed?
(Combinations are listed as follows: n, l, m(l), m(s).)

Accepted Answer

A)  4 0 0 -1/2 
B)  5 3 1 -1/2 
C)  4 1 1 1/2 
D)  3 1 0 1/2 
E)  3 3 0 -1/2 
A)  4 0 0 -1/2 
B)  5 3 1 -1/2 
C)  4 1 1 1/2 
D)  3 1 0 1/2 
E)  3 3 0 -1/2

Question 18

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)  Cu 
C)  K 
D)  Ne 
E)  V 
A)  S 
B)  Cu 
C)  K 
D)  Ne 
E)  V

Question 19

Researchers recently formed a new synthetic element with atomic number 108. Which of the following elements would have chemical properties most similar to this new element?

Accepted Answer

A)  Mo 
B)  Ac 
C)  Ti 
D)  Kr 
E)  Fe 
A)  Mo 
B)  Ac 
C)  Ti 
D)  Kr 
E)  Fe

Question 20

Write the electron configuration for the following:
-O2-

Accepted Answer

An element has the electron configuration [Kr] 4d¹⁰5s²5p². The element is a(n)

What is the electron configuration of Cr³⁺?

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

From the following list of observations, choose the one that most clearly supports the conclusion that electrons have wave properties.

Which of the following atoms or ions has 3 unpaired electrons?

For which element are the d orbitals completely filled in the neutral atom?

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

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -[Kr] 4d¹⁰5s²5p¹

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

what will be the kinetic energy of the ejected electrons? h = 6.626 x 10^-34J^.s, c = 2.998 x 10⁸ m/s

Consider the following portion of the energy-level diagram for hydrogen: -On a planet where the temperature is so high, the ground state of an electron in the hydrogen atom is n = 4. What is the ratio of IE on this planet to that on earth?

Which atomic species, in its ground state, has six unpaired electrons?

Which of the following statements is false?

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -1s²2s²2p⁵

What is the electron configuration of indium?

Which of the following combinations of quantum numbers is not allowed? (Combinations are listed as follows: n, l, m₍_l₎, m₍_s).)

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

Researchers recently formed a new synthetic element with atomic number 108. Which of the following elements would have chemical properties most similar to this new element?

Write the electron configuration for the following: -O^2-

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

An element has the electron configuration [Kr] 4d105s25p2. The element is a(n)

What is the electron configuration of Cr3+?

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

From the following list of observations, choose the one that most clearly supports the conclusion that electrons have wave properties.

Which of the following atoms or ions has 3 unpaired electrons?

For which element are the d orbitals completely filled in the neutral atom?

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

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -[Kr] 4d105s25p1

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

what will be the kinetic energy of the ejected electrons? h = 6.626 x 10-34J.s, c = 2.998 x 108 m/s

Consider the following portion of the energy-level diagram for hydrogen: -On a planet where the temperature is so high, the ground state of an electron in the hydrogen atom is n = 4. What is the ratio of IE on this planet to that on earth?

Which atomic species, in its ground state, has six unpaired electrons?

Which of the following statements is false?

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -1s22s22p5

What is the electron configuration of indium?

Which of the following combinations of quantum numbers is not allowed? (Combinations are listed as follows: n, l, m(l), m(s).)

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

Researchers recently formed a new synthetic element with atomic number 108. Which of the following elements would have chemical properties most similar to this new element?

Write the electron configuration for the following: -O2-

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

An element has the electron configuration [Kr] 4d¹⁰5s²5p². The element is a(n)

What is the electron configuration of Cr³⁺?

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -[Kr] 4d¹⁰5s²5p¹

what will be the kinetic energy of the ejected electrons? h = 6.626 x 10^-34J^.s, c = 2.998 x 10⁸ m/s

Given the electron configurations of the following neutral atoms, identify the element, and state the number of unpaired electrons in its ground state. -1s²2s²2p⁵

Which of the following combinations of quantum numbers is not allowed? (Combinations are listed as follows: n, l, m₍_l₎, m₍_s).)

Write the electron configuration for the following: -O^2-