Question 1

In a single atom, what is the maximum number of electrons that can have quantum number n = 4?

Accepted Answer

A)  16 
B)  18 
C)  32 
D)  36 
E)  None of these choices is correct. 
A)  16 
B)  18 
C)  32 
D)  36 
E)  None of these choices is correct.

Question 2

Select the correct electron configuration for sulfur (Z = 16).

Accepted Answer

A)  1s21p62s22p6 
B)  1s22s22p83s23p4 
C)  1s22s22p83s23p2 
D)  1s22s22p63s23p4 
E)  1s22s22p63s23d4 
A)  1s21p62s22p6 
B)  1s22s22p83s23p4 
C)  1s22s22p83s23p2 
D)  1s22s22p63s23p4 
E)  1s22s22p63s23d4

Question 3

Which of the following elements has the largest second ionization energy (IE2)?

Accepted Answer

A)  Li 
B)  B 
C)  O 
D)  F 
E)  Na 
A)  Li 
B)  B 
C)  O 
D)  F 
E)  Na

Question 4

Elements with ________________ first ionization energies and ___________ electron affinities generally form cations.

Accepted Answer

A)  low, very negative 
B)  high, positive or slightly negative 
C)  low, positive or slightly negative 
D)  high, very negative 
E)  None of these choices is generally correct. 
A)  low, very negative 
B)  high, positive or slightly negative 
C)  low, positive or slightly negative 
D)  high, very negative 
E)  None of these choices is generally correct.

Question 5

d8?

Accepted Answer

A)  2 
B)  6 
C)  8 
D)  10 
E)  None of these choices is correct. 
A)  2 
B)  6 
C)  8 
D)  10 
E)  None of these choices is correct.

Question 6

Atomic size decreases across a period due to an increase in the effective nuclear charge, Zeff.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following fourth-period elements has the smallest atomic radius?

Accepted Answer

A)  K 
B)  Ti 
C)  Cu 
D)  Ge 
E)  Kr 
A)  K 
B)  Ti 
C)  Cu 
D)  Ge 
E)  Kr

Question 8

Which one of the following equations correctly represents the process relating to the ionization energy of X?

Accepted Answer

A)  X(s) $\rightarrow$ X+(g) + e¯ 
B)  X2(g) $\rightarrow$ X+(g) + X¯(g) 
C)  X(g) + e¯ $\rightarrow$ X¯(g) 
D)  X¯(g) $\rightarrow$ X(g) + e¯ 
E)  X(g) $\rightarrow$ X+(g) + e¯ 
A)  X(s) $\rightarrow$ X+(g) + e¯ 
B)  X2(g) $\rightarrow$ X+(g) + X¯(g) 
C)  X(g) + e¯ $\rightarrow$ X¯(g) 
D)  X¯(g) $\rightarrow$ X(g) + e¯ 
E)  X(g) $\rightarrow$ X+(g) + e¯

Question 9

Which of the following elements has the smallest atomic size?

Accepted Answer

A)  Na 
B)  Ar 
C)  K 
D)  Ca 
E)  Kr 
A)  Na 
B)  Ar 
C)  K 
D)  Ca 
E)  Kr

Question 10

Define what is meant by electron affinity, and write a balanced chemical equation to represent the relevant process for element Y.

Accepted Answer

Electron affinity is the energ

Question 11

Identify the element of Period 2 which has the following successive ionization energies, in kJ/mol.

Accepted Answer

A)  Li 
B)  B 
C)  O 
D)  Ne 
E)  None of these choices is correct. 
A)  Li 
B)  B 
C)  O 
D)  Ne 
E)  None of these choices is correct.

Question 12

d10np3?

Accepted Answer

A)  2 
B)  3 
C)  5 
D)  10 
E)  15 
A)  2 
B)  3 
C)  5 
D)  10 
E)  15

Question 13

Hund's rule is used to predict the electron configuration of atoms in excited states.

Accepted Answer

A) True 
 B)False

Question 14

Which of the following elements has the greatest atomic radius?

Accepted Answer

A)  Li 
B)  Ne 
C)  Rb 
D)  Sr 
E)  Xe 
A)  Li 
B)  Ne 
C)  Rb 
D)  Sr 
E)  Xe

Question 15

Which one of the following statements about atomic structure and quantum numbers is incorrect?

Accepted Answer

A)  In a given atom, 18 is the maximum number of electrons having principal quantum number n = 3. 
B)  The number of orbitals in a given f subshell is 7. 
C)  For n = 4, the largest possible value of l is 3. 
D)  For n = 4, the largest possible value of ml is 2. 
E)  The following set of quantum numbers for a single orbital is not allowed: n = 3, l = 1, ml = -2. 
A)  In a given atom, 18 is the maximum number of electrons having principal quantum number n = 3. 
B)  The number of orbitals in a given f subshell is 7. 
C)  For n = 4, the largest possible value of l is 3. 
D)  For n = 4, the largest possible value of ml is 2. 
E)  The following set of quantum numbers for a single orbital is not allowed: n = 3, l = 1, ml = -2.

Question 16

Which of the following electron configurations is not possible for an atom in an excited state?

Accepted Answer

A)  1s22s22p63s23p63d104s14p1 
B)  1s22s22p63s13p5 
C)  1s22s22p63s23p23d2 
D)  1s22s22p63s23p63d104s2 
E)  1s22s22p63s23p63d104s14p3 
A)  1s22s22p63s23p63d104s14p1 
B)  1s22s22p63s13p5 
C)  1s22s22p63s23p23d2 
D)  1s22s22p63s23p63d104s2 
E)  1s22s22p63s23p63d104s14p3

Question 17

Elements in the same period of the periodic table have similar valence shell electron configurations.

Accepted Answer

A) True 
 B)False

Question 18

Elements in which the outermost electron has the same principal quantum number n, show similar chemical properties.

Accepted Answer

A) True 
 B)False

Question 19

The maximum number of electrons in an atom with the same value of n is 2n2.

Accepted Answer

A) True 
 B)False

Question 20

Consider the set of isoelectronic atoms and ions A2¯, B¯, C, D+, and E2+. Which arrangement of relative radii is correct?

Accepted Answer

A)  A2¯ > B¯ > C > D+ > E2+ 
B)  E2+ > D+ > C > B¯ > A2¯ 
C)  A2¯ > B¯ > C + 2+ 
D)  A2¯ ¯  D+ > E2+ 
E)  None of these choices is correct. 
A)  A2¯ > B¯ > C > D+ > E2+ 
B)  E2+ > D+ > C > B¯ > A2¯ 
C)  A2¯ > B¯ > C + 2+ 
D)  A2¯ ¯  D+ > E2+ 
E)  None of these choices is correct.

Exam 8: Electron Configuration and Chemical Periodicity

In a single atom, what is the maximum number of electrons that can have quantum number n = 4?

Select the correct electron configuration for sulfur (Z = 16).

Which of the following elements has the largest second ionization energy (IE2)?

Elements with ________________ first ionization energies and ___________ electron affinities generally form cations.

d8?

Atomic size decreases across a period due to an increase in the effective nuclear charge, Zeff.

Which of the following fourth-period elements has the smallest atomic radius?

Which one of the following equations correctly represents the process relating to the ionization energy of X?

Which of the following elements has the smallest atomic size?

Define what is meant by electron affinity, and write a balanced chemical equation to represent the relevant process for element Y.

Identify the element of Period 2 which has the following successive ionization energies, in kJ/mol.

d10np3?

Hund's rule is used to predict the electron configuration of atoms in excited states.

Which of the following elements has the greatest atomic radius?

Which one of the following statements about atomic structure and quantum numbers is incorrect?

Which of the following electron configurations is not possible for an atom in an excited state?

Elements in the same period of the periodic table have similar valence shell electron configurations.

Elements in which the outermost electron has the same principal quantum number n, show similar chemical properties.

The maximum number of electrons in an atom with the same value of n is 2n2.

Consider the set of isoelectronic atoms and ions A2¯, B¯, C, D+, and E2+. Which arrangement of relative radii is correct?

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Which of the following elements has the largest second ionization energy (IE₂)?

Elements with ______ first ionization energies and _ electron affinities generally form cations.

d⁸?

Atomic size decreases across a period due to an increase in the effective nuclear charge, Z_eff.

d¹⁰np³?

The maximum number of electrons in an atom with the same value of n is 2n².

Consider the set of isoelectronic atoms and ions A^2¯, B^¯, C, D⁺, and E²⁺. Which arrangement of relative radii is correct?