CEM 141 EXAM 2 MSU NEWEST 2026 ACTUAL EXAM
TEST BANK| MSU CEM 141 EXAM 2 REVIEW WITH 300
REAL EXAM QUESTIONS AND CORRECT VERIFIED
ANSWERS/ ALREADY GRADED A+ (MOST RECENT!!)
Q1: Which of the following elements has the largest atomic
radius?
A) Oxygen
B) Fluorine
C) Nitrogen
D) Boron
Answer: D
Rationale: Atomic radius decreases left to right across a period.
Boron is farthest left among the options, so it has the largest
radius.
Q2: Which of the following has the highest first ionization
energy?
A) Na
B) Mg
1
,C) Al
D) Si
Answer: D
Rationale: Ionization energy increases left to right across a
period. Silicon (Si) is farthest right among the options.
Q3: Which statement best describes electronegativity?
A) The energy required to remove an electron
B) The ability of an atom to attract electrons in a chemical bond
C) The size of an atom’s radius
D) The number of valence electrons
Answer: B
Rationale: Electronegativity is the measure of an atom’s
attraction for bonding electrons.
Q4: Which bond is the most polar?
A) C–H
B) O–H
C) N–H
D) F–H
2
,Answer: D
Rationale: Fluorine has the highest electronegativity (4.0), so F–H
has the largest electronegativity difference.
Q5: How many valence electrons does sulfur (S) have?
A) 2
B) 4
C) 6
D) 8
Answer: C
Rationale: Sulfur is in Group 16 of the periodic table, so it has 6
valence electrons.
Q6: Which of the following is an isoelectronic series?
A) Na⁺, Mg²⁺, Al³⁺
B) O, F, Ne
C) Cl⁻, Ar, K⁺
D) Both A and C
3
, Answer: D
Rationale: Na⁺ (10 e⁻), Mg²⁺ (10 e⁻), Al³⁺ (10 e⁻) are
isoelectronic; likewise Cl⁻ (18 e⁻), Ar (18 e⁻), K⁺ (18 e⁻).
Q7: Which element has the electron configuration [Ne]3s²3p³?
A) Nitrogen
B) Phosphorus
C) Arsenic
D) Aluminum
Answer: B
Rationale: [Ne]3s²3p³ sums to 15 electrons, which is phosphorus
(P).
Q8: Which of the following ions is largest in radius?
A) O²⁻
B) F⁻
C) Na⁺
D) Mg²⁺
Answer: A
Rationale: O²⁻ has the most negative charge and same electron
4
TEST BANK| MSU CEM 141 EXAM 2 REVIEW WITH 300
REAL EXAM QUESTIONS AND CORRECT VERIFIED
ANSWERS/ ALREADY GRADED A+ (MOST RECENT!!)
Q1: Which of the following elements has the largest atomic
radius?
A) Oxygen
B) Fluorine
C) Nitrogen
D) Boron
Answer: D
Rationale: Atomic radius decreases left to right across a period.
Boron is farthest left among the options, so it has the largest
radius.
Q2: Which of the following has the highest first ionization
energy?
A) Na
B) Mg
1
,C) Al
D) Si
Answer: D
Rationale: Ionization energy increases left to right across a
period. Silicon (Si) is farthest right among the options.
Q3: Which statement best describes electronegativity?
A) The energy required to remove an electron
B) The ability of an atom to attract electrons in a chemical bond
C) The size of an atom’s radius
D) The number of valence electrons
Answer: B
Rationale: Electronegativity is the measure of an atom’s
attraction for bonding electrons.
Q4: Which bond is the most polar?
A) C–H
B) O–H
C) N–H
D) F–H
2
,Answer: D
Rationale: Fluorine has the highest electronegativity (4.0), so F–H
has the largest electronegativity difference.
Q5: How many valence electrons does sulfur (S) have?
A) 2
B) 4
C) 6
D) 8
Answer: C
Rationale: Sulfur is in Group 16 of the periodic table, so it has 6
valence electrons.
Q6: Which of the following is an isoelectronic series?
A) Na⁺, Mg²⁺, Al³⁺
B) O, F, Ne
C) Cl⁻, Ar, K⁺
D) Both A and C
3
, Answer: D
Rationale: Na⁺ (10 e⁻), Mg²⁺ (10 e⁻), Al³⁺ (10 e⁻) are
isoelectronic; likewise Cl⁻ (18 e⁻), Ar (18 e⁻), K⁺ (18 e⁻).
Q7: Which element has the electron configuration [Ne]3s²3p³?
A) Nitrogen
B) Phosphorus
C) Arsenic
D) Aluminum
Answer: B
Rationale: [Ne]3s²3p³ sums to 15 electrons, which is phosphorus
(P).
Q8: Which of the following ions is largest in radius?
A) O²⁻
B) F⁻
C) Na⁺
D) Mg²⁺
Answer: A
Rationale: O²⁻ has the most negative charge and same electron
4
