Question 1

What is the ground-state electron configuration of tantalum (Ta)?

Accepted Answer

A) 1s22s22p63s23p64s24p64d104f145s25p3 
B) 1s22s22p63s23p63d104s24p64d105s25p3 
C) 1s22s22p63s23p63d104s24p64d104f145s25p65d36s2 
D) 1s22s22p63s23p63d104s24p64d105s25p65d3 
E) 1s22s22p63s23p63d104s24p64d104f3 
A) 1s22s22p63s23p64s24p64d104f145s25p3 
B) 1s22s22p63s23p63d104s24p64d105s25p3 
C) 1s22s22p63s23p63d104s24p64d104f145s25p65d36s2 
D) 1s22s22p63s23p63d104s24p64d105s25p65d3 
E) 1s22s22p63s23p63d104s24p64d104f3

Question 2

Which of the following sets of four quantum numbers (n,l,ml, ms)correctly describes an electron occupying a d orbital of an element in the third row of the transition metals?

Accepted Answer

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

Question 3

The elements that are filling the 5f subshell are called

Accepted Answer

A) alkali metals. 
B) transition elements. 
C) lanthanides. 
D) actinides. 
E) main-group elements. 
A) alkali metals. 
B) transition elements. 
C) lanthanides. 
D) actinides. 
E) main-group elements.

Question 4

An atom of which of the following elements has the smallest atomic radius?

Accepted Answer

A) Cl 
B) Rb 
C) Mg 
D) Si 
E) As 
A) Cl 
B) Rb 
C) Mg 
D) Si 
E) As

Question 5

What noble gas core would be used when writing the ground state electron configuration for magnesium (Mg)?

Accepted Answer

A) [Ne] 
B) [Xe] 
C) [Rn] 
D) [He] 
E) [Ar] 
A) [Ne] 
B) [Xe] 
C) [Rn] 
D) [He] 
E) [Ar]

Question 6

Which principle or rule is violated by the following orbital diagram of an atom in its ground state?
1s 2s 2p

Accepted Answer

A) Pauli exclusion principle 
B) Hund's rule 
C) Heisenberg uncertainty principle 
D) No rules or principles are violated by this orbital diagram. 
E) Building-up principle 
A) Pauli exclusion principle 
B) Hund's rule 
C) Heisenberg uncertainty principle 
D) No rules or principles are violated by this orbital diagram. 
E) Building-up principle

Question 7

An atom of which of the following elements has the largest first ionization energy?

Accepted Answer

A) B 
B) In 
C) Ga 
D) Al 
E) Tl 
A) B 
B) In 
C) Ga 
D) Al 
E) Tl

Question 8

The element tellurium is in the same group as sulfur.Which of the following is the formula of tellurous acid?

Accepted Answer

A) H2Te2O5 
B) ​H2TeO2 
C) ​H2TeO3 
D) ​H2TeO4 
E) ​H2Te 
A) H2Te2O5 
B) ​H2TeO2 
C) ​H2TeO3 
D) ​H2TeO4 
E) ​H2Te

Question 9

The electron affinity value expected for the process   would be

Accepted Answer

A) a small negative number. 
B) a large positive number. 
C) a small positive number. 
D) a large negative number. 
E) zero. 
A) a small negative number. 
B) a large positive number. 
C) a small positive number. 
D) a large negative number. 
E) zero.

Question 10

An atom of which of the following elements has the smallest atomic radius?

Accepted Answer

A) Tl 
B) B 
C) In 
D) Ga 
E) Al 
A) Tl 
B) B 
C) In 
D) Ga 
E) Al

Question 11

An atom of which of the following elements has the largest atomic radius?

Accepted Answer

A) Ca 
B) Sr 
C) Mg 
D) Ba 
E) Be 
A) Ca 
B) Sr 
C) Mg 
D) Ba 
E) Be

Question 12

What is the valence-shell electron configuration for the fourth-period element in Group VA?

Accepted Answer

A) 4s25p5 
B) 5s25p5 
C) 4s24p3 
D) 5s24p5 
E) 4s23d3 
A) 4s25p5 
B) 5s25p5 
C) 4s24p3 
D) 5s24p5 
E) 4s23d3

Question 13

In general,atomic radii

Accepted Answer

A) decrease from left to right in a period and increase down a group. 
B) increase from left to right in a period and decrease down a group. 
C) do not change across a period or a group. 
D) decrease from left to right and decrease down a group. 
E) increase from left to right in a period and increase down a group. 
A) decrease from left to right in a period and increase down a group. 
B) increase from left to right in a period and decrease down a group. 
C) do not change across a period or a group. 
D) decrease from left to right and decrease down a group. 
E) increase from left to right in a period and increase down a group.

Question 14

In which of the series of elements listed below would the elements have most nearly the same atomic radius?

Accepted Answer

A) Na,K,Rb,Cs 
B) F,Cl,Br,I 
C) Na,Mg,Al,Si 
D) Sc,Ti,V,Cr 
E) B,Si,As,Te 
A) Na,K,Rb,Cs 
B) F,Cl,Br,I 
C) Na,Mg,Al,Si 
D) Sc,Ti,V,Cr 
E) B,Si,As,Te

Question 15

Which of the following statements is true about the ionization energy of Mg+?

Accepted Answer

A) It will be equal to and opposite in sign to the electron affinity of Mg+. 
B) It will be equal to and opposite in sign to the electron affinity of Mg. 
C) It will be equal to and opposite in sign to the electron affinity of Mg2+. 
D) It will be equal to the ionization energy of Li. 
E) none of the above 
A) It will be equal to and opposite in sign to the electron affinity of Mg+. 
B) It will be equal to and opposite in sign to the electron affinity of Mg. 
C) It will be equal to and opposite in sign to the electron affinity of Mg2+. 
D) It will be equal to the ionization energy of Li. 
E) none of the above

Question 16

Which of the following are incorrectly paired?

Accepted Answer

A) Group IIA,alkaline earth metals 
B) Group IA,alkali metals 
C) Group VIIIA,noble gases 
D) Group IVA,halogens 
E) Group VIA,chalcogens 
A) Group IIA,alkaline earth metals 
B) Group IA,alkali metals 
C) Group VIIIA,noble gases 
D) Group IVA,halogens 
E) Group VIA,chalcogens

Question 17

The ground-state electron configuration of a Mn2+ ion is 1s22s22p63s23p63d5.Therefore,Mn2+ is

Accepted Answer

A) paramagnetic with five unpaired electrons. 
B) diamagnetic. 
C) paramagnetic with one unpaired electron. 
D) paramagnetic with three unpaired electrons. 
E) paramagnetic with two unpaired electrons. 
A) paramagnetic with five unpaired electrons. 
B) diamagnetic. 
C) paramagnetic with one unpaired electron. 
D) paramagnetic with three unpaired electrons. 
E) paramagnetic with two unpaired electrons.

Question 18

Below are data on the first four ionization energies for a fictitious element X.
First ionization energy = 500 kJ/mol
Second ionization energy = 2000 kJ/mol
Third ionization energy = 3500 kJ/mol
Fourth ionization energy = 25000 kJ/mol
From the data,which of the following statements is incorrect?

Accepted Answer

A) The third ionization energy is greater than the second ionization energy because X2+ has a bigger charge than X+. 
B) X could belong to Group IIIA. 
C) X could belong to Group IIIB. 
D) X could belong to group VA. 
E) The fourth ionization energy is much greater than the third ionization energy because X3+ consists of a noble-gas core or a pseudo-noble-gas core. 
A) The third ionization energy is greater than the second ionization energy because X2+ has a bigger charge than X+. 
B) X could belong to Group IIIA. 
C) X could belong to Group IIIB. 
D) X could belong to group VA. 
E) The fourth ionization energy is much greater than the third ionization energy because X3+ consists of a noble-gas core or a pseudo-noble-gas core.

Question 19

An unknown element,X,reacts with oxygen to form two oxides with the general formula X2O3 and X2O5.The pure element is strongly paramagnetic,and the oxides are amphoteric.Which of the following elements could be represented by X?

Accepted Answer

A) Sc 
B) Na 
C) Bi 
D) S 
E) Sb 
A) Sc 
B) Na 
C) Bi 
D) S 
E) Sb

Question 20

How many unpaired electrons are found in the ground state electron configuration of silicon (Si)?

Accepted Answer

A) 2 
B) 3 
C) 5 
D) 0 
E) 1 
A) 2 
B) 3 
C) 5 
D) 0 
E) 1

Exam 8: Electron Configurations and Periodicity

What is the ground-state electron configuration of tantalum (Ta)?

Which of the following sets of four quantum numbers (n,l,ml, ms)correctly describes an electron occupying a d orbital of an element in the third row of the transition metals?

The elements that are filling the 5f subshell are called

An atom of which of the following elements has the smallest atomic radius?

What noble gas core would be used when writing the ground state electron configuration for magnesium (Mg)?

Which principle or rule is violated by the following orbital diagram of an atom in its ground state? 1s 2s 2p

An atom of which of the following elements has the largest first ionization energy?

The element tellurium is in the same group as sulfur.Which of the following is the formula of tellurous acid?

The electron affinity value expected for the process would be

An atom of which of the following elements has the smallest atomic radius?

An atom of which of the following elements has the largest atomic radius?

What is the valence-shell electron configuration for the fourth-period element in Group VA?

In general,atomic radii

In which of the series of elements listed below would the elements have most nearly the same atomic radius?

Which of the following statements is true about the ionization energy of Mg+?

Which of the following are incorrectly paired?

The ground-state electron configuration of a Mn2+ ion is 1s22s22p63s23p63d5.Therefore,Mn2+ is

Below are data on the first four ionization energies for a fictitious element X. First ionization energy = 500 kJ/mol Second ionization energy = 2000 kJ/mol Third ionization energy = 3500 kJ/mol Fourth ionization energy = 25000 kJ/mol From the data,which of the following statements is incorrect?

An unknown element,X,reacts with oxygen to form two oxides with the general formula X2O3 and X2O5.The pure element is strongly paramagnetic,and the oxides are amphoteric.Which of the following elements could be represented by X?

How many unpaired electrons are found in the ground state electron configuration of silicon (Si)?

Chemistry and Measurement

Atoms, molecules, and Ions

Calculations With Chemical Formulas and Equations

Chemical Reactions

The Gaseous State

Thermochemistry

Quantum Theory of the Atom

Ionic and Covalent Bonding

Molecular Geometry and Chemical Bonding Theory

States of Matter; Liquids and Solids

Solutions

Rates of Reaction

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex-Ion Equilibria

Thermodynamics and Equilibrium

Electrochemistry

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Chemistry of the Main-Group Metals

The Transition Elements and Coordination Compounds

Organic Chemistry

Polymer Materials: Synthetic and Biological

Filters

Which of the following sets of four quantum numbers (n,l,ml_, m_s)correctly describes an electron occupying a d orbital of an element in the third row of the transition metals?

Which of the following statements is true about the ionization energy of Mg⁺?

The ground-state electron configuration of a Mn²⁺ ion is 1s²2s²2p⁶3s²3p⁶3d⁵.Therefore,Mn²⁺ is

An unknown element,X,reacts with oxygen to form two oxides with the general formula X₂O₃ and X₂O₅.The pure element is strongly paramagnetic,and the oxides are amphoteric.Which of the following elements could be represented by X?