CHEM 1411 EXAM 3 QUESTIONS WITH
100% CORRECT ANSWERS L LATEST
VERSION 2025/2026.
What is the ground-state electron configuration of the ion Hg2+? - ANS [Xe] 4f145d10
What is the ground-state electron configuration of the ion Cu2+? - ANS [Ar] 3d9
Which of the following three sets consist of atoms or ions with the same electron configuration
in the ground state?
I) O2-, Ne, and Mg2+
II) Ni, Cu+, and Zn2+
III) Hg, Ti+, and Pb2+ - ANS I) and III)
Which ion has the same electron configuration as Kr? - ANS All of these
Consider which of the following ground state electron configuration. ts22s22p4. Which of the
following ions has this ground state elctron configuration? - ANS C-2
Which ion has the smallest ionic radius? - ANS Li+
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,Which ion has the smallest ionic radius?
(Same question, different choices) - ANS F-
Arrange the ions N3-, 02-, Mg2+, Na+, and F- in order of increasing ionic radius, starting with the
smallest first. - ANS Mg2+, Na+, F-, O2-, N3-
Of the following, which element has the highest first ionization energy? - ANS Helium
Of the following, which element has the highest first ionization energy?
(Same question, different choices) - ANS Fluorine
Which of the following represents the change in electronic configuration that is associated with
the second ionization energy of magnesium? - ANS [Ne] 3s1 -> [Ne] + e-
Which of the following atoms with the specified electronic configuration would have the
*lowest* first ionization energy? - ANS [Xe] 6s1
Which ionization process requires the most energy? - ANS Al3+(g) --> Al4+(g) + e-
List the elements Na, Ca, Rb, Cl, He in order of decreasing first ionization energy. -
ANS He>Cl>Ca>Na>Rb
Of the following which element has the highest first ionization energy? - ANS N
Which period 3 element has successive first through seventh ionization energies (kj/mol) of E!1
= 578, E!2 = 1817, E!3 =2745, E!4 = 11575, E!5 = 14830, E!6 = 18376, E!7 = 23293 - ANS Al
Which electron affinity process would liberate the most energy? - ANS [He] 2s2 2p2 + e- ->
[He] 2s2 2p1
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, Which element has the most favorable (most negative) electron affinity? - ANS C
Which element has the most favorable (most negative electron affinity?
(Same question, different choices) - ANS S
What is the general trend in ionization energy and electron affinity values? - ANS Both
increase as one transverses a period from left to right and both decrease as one descends a
group.
An element that has the valence electron configuration 3s2 3p3 belongs to which period and
end group? - ANS Period 3; Group 5A
In the reaction of sodium metal with chlorine gas which of the following processes releases
energy? - ANS Cl(g) +e- -> Cl-(g)
Calculate the energy for the formation of LiCl(s) from its elements in their standard states and
the following tabulated information:
Li(s) + 1/2 Cl2(g) -> LiCl(s)......................?
Li+(g) + Cl-(g) -> LiCl(s)...........................-853 kj/mol
Li(s) -> Li(g)...................................................+159.4 kj/mol
1/2 Cl2(g) -> Cl(g)......................................+121.7 kj/mol
Cl(g) + e- -> Cl-(g)....................................-348.6 kj/mol
Li(g) -> Li+(g) + e-.......................................+520.2 kj/mol - ANS -400.3 kj/mol
Calculate the energy for the formation of CaF2(s) from its elements in their standard states and
the following information:
Ca(s) + F2(g) -> CaF2(s)....................?
Ca(s) -> Ca(g).......................................+179.3 kj/mol
Ca(g) -> Ca+(g) + e-...........................+589.9 kj/mol
Ca+(g) -> Ca2+(g) + e-.......................+1145 kj/mol
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100% CORRECT ANSWERS L LATEST
VERSION 2025/2026.
What is the ground-state electron configuration of the ion Hg2+? - ANS [Xe] 4f145d10
What is the ground-state electron configuration of the ion Cu2+? - ANS [Ar] 3d9
Which of the following three sets consist of atoms or ions with the same electron configuration
in the ground state?
I) O2-, Ne, and Mg2+
II) Ni, Cu+, and Zn2+
III) Hg, Ti+, and Pb2+ - ANS I) and III)
Which ion has the same electron configuration as Kr? - ANS All of these
Consider which of the following ground state electron configuration. ts22s22p4. Which of the
following ions has this ground state elctron configuration? - ANS C-2
Which ion has the smallest ionic radius? - ANS Li+
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,Which ion has the smallest ionic radius?
(Same question, different choices) - ANS F-
Arrange the ions N3-, 02-, Mg2+, Na+, and F- in order of increasing ionic radius, starting with the
smallest first. - ANS Mg2+, Na+, F-, O2-, N3-
Of the following, which element has the highest first ionization energy? - ANS Helium
Of the following, which element has the highest first ionization energy?
(Same question, different choices) - ANS Fluorine
Which of the following represents the change in electronic configuration that is associated with
the second ionization energy of magnesium? - ANS [Ne] 3s1 -> [Ne] + e-
Which of the following atoms with the specified electronic configuration would have the
*lowest* first ionization energy? - ANS [Xe] 6s1
Which ionization process requires the most energy? - ANS Al3+(g) --> Al4+(g) + e-
List the elements Na, Ca, Rb, Cl, He in order of decreasing first ionization energy. -
ANS He>Cl>Ca>Na>Rb
Of the following which element has the highest first ionization energy? - ANS N
Which period 3 element has successive first through seventh ionization energies (kj/mol) of E!1
= 578, E!2 = 1817, E!3 =2745, E!4 = 11575, E!5 = 14830, E!6 = 18376, E!7 = 23293 - ANS Al
Which electron affinity process would liberate the most energy? - ANS [He] 2s2 2p2 + e- ->
[He] 2s2 2p1
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, Which element has the most favorable (most negative) electron affinity? - ANS C
Which element has the most favorable (most negative electron affinity?
(Same question, different choices) - ANS S
What is the general trend in ionization energy and electron affinity values? - ANS Both
increase as one transverses a period from left to right and both decrease as one descends a
group.
An element that has the valence electron configuration 3s2 3p3 belongs to which period and
end group? - ANS Period 3; Group 5A
In the reaction of sodium metal with chlorine gas which of the following processes releases
energy? - ANS Cl(g) +e- -> Cl-(g)
Calculate the energy for the formation of LiCl(s) from its elements in their standard states and
the following tabulated information:
Li(s) + 1/2 Cl2(g) -> LiCl(s)......................?
Li+(g) + Cl-(g) -> LiCl(s)...........................-853 kj/mol
Li(s) -> Li(g)...................................................+159.4 kj/mol
1/2 Cl2(g) -> Cl(g)......................................+121.7 kj/mol
Cl(g) + e- -> Cl-(g)....................................-348.6 kj/mol
Li(g) -> Li+(g) + e-.......................................+520.2 kj/mol - ANS -400.3 kj/mol
Calculate the energy for the formation of CaF2(s) from its elements in their standard states and
the following information:
Ca(s) + F2(g) -> CaF2(s)....................?
Ca(s) -> Ca(g).......................................+179.3 kj/mol
Ca(g) -> Ca+(g) + e-...........................+589.9 kj/mol
Ca+(g) -> Ca2+(g) + e-.......................+1145 kj/mol
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