Question 1

Which of the following elements has the smallest 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 2

How many valence electrons are there in an atom with the electron configuration [noble gas]ns2(n -1)d10np3?

Accepted Answer

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

Question 3

Select the element with the greatest metallic character.

Accepted Answer

A)  Li 
B)  Ca 
C)  Al 
D)  Pb 
E)  Cs 
A)  Li 
B)  Ca 
C)  Al 
D)  Pb 
E)  Cs

Question 4

Select the correct set of quantum numbers (n, l, ml, ms) for the first electron removed in the formation of a cation for strontium, Sr.

Accepted Answer

A)  5, 1 , 0, -½ 
B)  5, 1, 0, ½ 
C)  5, 0, 1, ½ 
D)  5, 1, 1, ½ 
E)  5, 0, 0, -½ 
A)  5, 1 , 0, -½ 
B)  5, 1, 0, ½ 
C)  5, 0, 1, ½ 
D)  5, 1, 1, ½ 
E)  5, 0, 0, -½

Question 5

Which of the following ions will be most likely to form when selenium ionizes?

Accepted Answer

A)  Se6+ 
B)  Se4+ 
C)  Se2+ 
D)  Se2- 
E)  Se4- 
A)  Se6+ 
B)  Se4+ 
C)  Se2+ 
D)  Se2- 
E)  Se4-

Question 6

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

Accepted Answer

A) True 
 B)False

Question 7

Metallic behavior is generally associated with

Accepted Answer

A)  elements with very negative electron affinities. 
B)  elements with low ionization energies. 
C)  elements with small atomic radii. 
D)  elements with unpaired electrons. 
E)  elements with partially filled p orbitals. 
A)  elements with very negative electron affinities. 
B)  elements with low ionization energies. 
C)  elements with small atomic radii. 
D)  elements with unpaired electrons. 
E)  elements with partially filled p orbitals.

Question 8

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

Accepted Answer

A)  In a given atom, the maximum number of electrons having principal quantum number n = 3, is 18. 
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, the maximum number of electrons having principal quantum number n = 3, is 18. 
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 9

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

Accepted Answer

A) True 
 B)False

Question 10

Select the element with the most negative electron affinity (i.e., accepts an electron most readily).

Accepted Answer

A)  H 
B)  Li 
C)  C 
D)  F 
E)  Ne 
A)  H 
B)  Li 
C)  C 
D)  F 
E)  Ne

Question 11

Which one of the following statements about orbital energies is incorrect?

Accepted Answer

A)  In the hydrogen atom, the energy of an orbital depends only on the value of the quantum number n. 
B)  In many-electron atoms the energy of an orbital depends on both n and l. 
C)  Inner electrons shield outer electrons more effectively than do electrons in the same orbital. 
D)  The splitting of sublevels in many-electron atoms is explained in terms of the penetration effect. 
E)  The energy of a given orbital increases as the nuclear charge Z increases. 
A)  In the hydrogen atom, the energy of an orbital depends only on the value of the quantum number n. 
B)  In many-electron atoms the energy of an orbital depends on both n and l. 
C)  Inner electrons shield outer electrons more effectively than do electrons in the same orbital. 
D)  The splitting of sublevels in many-electron atoms is explained in terms of the penetration effect. 
E)  The energy of a given orbital increases as the nuclear charge Z increases.

Question 12

Select the diamagnetic ion.

Accepted Answer

A)  Cu2+ 
B)  Ni2+ 
C)  Cr3+ 
D)  Sc3+ 
E)  Cr2+ 
A)  Cu2+ 
B)  Ni2+ 
C)  Cr3+ 
D)  Sc3+ 
E)  Cr2+

Question 13

Which of the following elements has the smallest first ionization energy?

Accepted Answer

A)  Rb 
B)  Mg 
C)  I 
D)  As 
E)  F 
A)  Rb 
B)  Mg 
C)  I 
D)  As 
E)  F

Question 14

"Electrons added to atomic orbitals of the same energy will remain unpaired with parallel spins until the subshell is more than half-filled" is a statement of

Accepted Answer

A)  the aufbau principle. 
B)  Hund's rule. 
C)  the Pauli exclusion principle. 
D)  the periodic law. 
E)  the singularity rule. 
A)  the aufbau principle. 
B)  Hund's rule. 
C)  the Pauli exclusion principle. 
D)  the periodic law. 
E)  the singularity rule.

Question 15

Consider the element with the electron configuration: [Rn]7s25f7. How would you classify this element?

Accepted Answer

A)  a representative element 
B)  a transition metal 
C)  a nonmetal 
D)  an actinide element 
E)  a noble gas 
A)  a representative element 
B)  a transition metal 
C)  a nonmetal 
D)  an actinide element 
E)  a noble gas

Question 16

In forming ions of the first series of transition metals, the 4s electrons are lost before the 3d electrons.

Accepted Answer

A) True 
 B)False

Question 17

Moseley's measurements of nuclear charges of the elements provided the basis for arranging the elements of the periodic table in order of increasing atomic number.

Accepted Answer

A) True 
 B)False

Exam 8: Electron Configuration and Chemical Periodicity

Which of the following elements has the smallest atomic radius?

How many valence electrons are there in an atom with the electron configuration [noble gas]ns2(n -1)d10np3?

Select the element with the greatest metallic character.

Select the correct set of quantum numbers (n, l, ml, ms) for the first electron removed in the formation of a cation for strontium, Sr.

Which of the following ions will be most likely to form when selenium ionizes?

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

Metallic behavior is generally associated with

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

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

Select the element with the most negative electron affinity (i.e., accepts an electron most readily).

Which one of the following statements about orbital energies is incorrect?

Select the diamagnetic ion.

Which of the following elements has the smallest first ionization energy?

"Electrons added to atomic orbitals of the same energy will remain unpaired with parallel spins until the subshell is more than half-filled" is a statement of

Consider the element with the electron configuration: [Rn]7s25f7. How would you classify this element?

In forming ions of the first series of transition metals, the 4s electrons are lost before the 3d electrons.

Moseley's measurements of nuclear charges of the elements provided the basis for arranging the elements of the periodic table in order of increasing atomic number.

Keys to Studying Chemistry Definitions, Units, and Problem Solving

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 Reaction Direction

Electrochemistry Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

How many valence electrons are there in an atom with the electron configuration [noble gas]ns²(n -1)d¹⁰np³?

Select the correct set of quantum numbers (n, l, m_l, m_s) for the first electron removed in the formation of a cation for strontium, Sr.

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