Unit 3 Study Guide
2.
Which of the following elements is an alkaline
earth metal?
A) Ca
B) Cu
C) Fe
D) Na
E) Sc
B)
C)
D)
E)
7
0
8
none of these
12.
The number of electrons in the third sublevel of an
iron atom is
A) 3
B) 6
C) 8
D) 26
E) 56
5.
Phosphorus has how many electrons in its
outermost principal energy level?
A) 1
B) 2
C) 3
D) 5
E) 15
13.
All these atoms have seven electrons in their
outermost energy levels except
A) H
B) F
C) Cl
D) Br
E) I
6.
The number of unpaired electrons in a nitrogen
atom is
A) 1
B) 2
C) 3
D) 4
E) 5
14.
The maximum number of electrons in the second
principal energy level of an atom is
A) 2
B) 6
C) 8
D) 18
E) 32
7.
The elements chlorine and iodine have similar
chemical properties because they
A) are both metals
B) are in the same chemical period
C) have the same number of electrons in their
outer energy levels
D) have the same number of stable isotopes
E) none of these
15.
Which element has the fewest electrons in its
valence shell?
A) Cs
B) Mg
C) P
D) O
E) Br
8.
The alkaline earth metals have how many valence
electrons?
A) 8
B) 7
C) 3
D) 2
E) 1
16.
9.
Which of the following is the highest energy orbital
for a silicon atom?
A) 1s
B) 2s
C) 3s
D) 3p
E) 3d
How many d electrons are there in an iron atom?
A) 2
B) 3
C) 6
D) 26
E) 56
17.
Which one of the following atoms has a partly
filled d sublevel?
A) Ca
B) Ni
C) Zn
D) As
E) Ar
10.
How many electrons are in the third principal
energy level (n = 3) of one atom of Fe?
A) 2
B) 8
C) 14
D) 18
E) none of these
24.
11.
The noble gases contain how many valence
electrons?
A) 1
Page 1
The electron configuration for manganese is
A) [Ar] 3d7
B) 1s22s22p63s13d6
C) [Ar] 4s23d5
D) 1s22s22p63s23d4
E) [Ar] 4s24p5
Unit 3 Study Guide
25.
Which of the following atoms has the electron
configuration 1s22s22p63s23p64s23d1?
A) Sc
B) Ca
C) Sr
D) Ar
E) none of these
34.
Which of the following atoms has the highest
ionization energy?
A) Na
B) Mg
C) Si
D) P
E) Cl
26.
How many unpaired electrons does the element
cobalt (Co) have in its lowest energy state?
A) 0
B) 1
C) 2
D) 3
E) 7
35.
Which of the following atoms has the smallest
atomic radius?
A) As
B) Sb
C) Bi
D) P
E) N
28.
How many of the following electron configurations
for the species in their ground state are correct?
I. Ca: 1s22s22p63s23p64s2
II. Mg: 1s22s22p63s1
III. V: [Ar] 3s23d3
IV. As: [Ar] 4s23d104p3
V. P: 1s22s22p63p5
A) 1
B) 2
C) 3
D) 4
E) 5
36.
Which of the following has the lowest ionization
energy?
A)
B)
C)
D)
E)
Se 2
Br 
Sr2+
Zr4+
Rb+
37.
Which of the following has the smallest atomic
radius?
A) N
B) F
C) Br
D) Cl
E) S
30.
What element has the electron configuration
1s22s22p63s23p64s23d104p5?
A) Cl
B) Se
C) I
D) Kr
E) Br
38.
Which of the following atoms has the highest
ionization energy?
A) Al
B) Si
C) P
D) As
E) Sb
31.
What element has the electron configuration
1s22s22p63s23p6?
A) Ar
B) Cl
C) Kr
D) S
E) none of these
E) Electrons cannot be removed from calcium
since it is a metal and only wants to gain electrons
to become more stable.
32.
What element has the electron configuration
1s22s22p63s23p64s23d104p65s24d105p66s2?
A) Ba
B) Sn
C) Pb
D) Po
E) none of these
40.
Which of the following exhibits the correct orders
for both atomic radius and ionization energy, respectively?
A) S, O, F, and F, O, S
B) F, S, O, and O, S, F
C) S, F, O, and S, F, O
D) F, O, S, and S, O, F
E) none of these
33.
Which of the following is ranked in order of largest
to smallest atomic radius?
A) Rb > Mn > S > Ge > F
B) F > S > Ge > Mn > Rb
C) Mn > Rb > F > S > Ge
D) Rb > Ge > Mn > F > S
E) Rb > Mn > Ge > S > F
41.
Of the metals in Group I, which has the highest
ionization energy?
A) Cs
B) Rb
C) K
D) Na
Page 2
Unit 3 Study Guide
E)
Li
C)
D)
E)
42.
Order the elements S, Cl, and F in terms of
increasing ionization energy.
A) S, Cl, F
B) Cl, F, S
C) F, S, Cl
D) F, Cl, S
E) S, F, Cl
44.
Order the following ions from smallest to largest
atomic size.
As3–, Se2–, Sr2+, Rb+, Br–
A) As3– < Se2– < Br– < Rb+ < Sr2+
B) Sr2+ < Rb+ < As3– < Se2– < Br–
C) As3– < Se2– < Br– < Sr2+ < Rb+
D) Rb+ < Br– < Sr2+ < As3– < Se2–
E) Sr2+ < Rb+ < Br– < Se2– < As3–
43.
Order the elements S, Cl, and F in terms of
increasing atomic radii.
A) S, Cl, F
B) Cl, F, S
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
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40.
41.
42.
43.
44.
45.
46.
Answer Key
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2.
3.
4.
5.
6.
7.
8.
9.
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11.
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15.
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18.
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22.
23.
F, S, Cl
F, Cl, S
S, F, Cl
D
A
A
E
D
C
C
D
E
C
D
B
A
C
A
C
B
A
A
D
D
E
D
Page 3
C
A
D
B
B
E
E
A
A
E
E
E
A
B
C
D
D
E
A
D
E
C
C