Lecture Exam 4 CHEM 1A Spring 2018 Written by Mr. Vazquez
Version A
1) Of the following, which element has the highest first ionization energy?
A) Sn
B) Te
C) I
D) Xe
Answer: D
2) Place the following in order of increasing radius.
Sr2⁺ Se2⁻ Br⁻
A) Sr2⁺ < Br⁻ < Se2⁻
B) Br⁻ < Sr2⁺ < Se2⁻
C) Se2⁻ < Br⁻ < Sr2⁺
D) Sr2⁺ < Se2⁻ < Br⁻
E) Br⁻ < Se2⁻ < Sr2⁺
Answer: A
3) Which element is the most metallic?
A) N
B) O
C) Cl
D) Br
4) Identify the elements correctly shown by decreasing radii size.
A) N3- > N
B) K+ > K
C) N > N3-
D) Cu2+ > Cu+
E) S– > S2-
Answer: A
5) Place the following in order of increasing magnitude of lattice energy.
CaO MgO SrS
A) MgO < CaO < SrS
B) SrS < MgO < CaO
C) SrS < CaO < MgO
D) CaO < MgO < SrS
E) CaO < SrS < MgO
Answer: C
Lecture Exam 4 CHEM 1A Spring 2018 Written by Mr. Vazquez
6) Identify the shortest bond.
A) single covalent bond
B) double covalent bond
C) triple covalent bond
D) All of the above bonds are the same length.
Answer: C
7) Identify the number of bonding pairs and lone pairs of electrons in O2.
A) 5 bonding pairs and 5 lone pairs
B) 4 bonding pair and 2 lone pairs
C) 2 bonding pairs and 4 lone pairs
D) 2 bonding pairs and 1 lone pair
E) 2 bonding pairs and 6 lone pairs
Answer: C
