MSU CEM 141 EXAMS 1, 2, 3 & FINAL EXAM NEWEST
2026 PACKAGE DEAL| MSU CEM 141 EXAM REVIEWS
WITH COMPLETE REAL EXAM QUESTIONS AND
CORRECT VERIFIED ANSWERS/ ALREADY GRADED A+
(MOST RECENT!!)
1. Which subatomic particle has the smallest mass?
A) Proton
B) Neutron
C) Electron
D) Nucleus
Correct Answer: C
Rationale: Electrons have a mass of approximately 1/1836
amu, while protons and neutrons are about 1 amu each.
2. According to Coulomb’s law, the electrostatic force between
two charged particles is:
A) Directly proportional to the product of charges and inversely
proportional to the square of the distance
B) Inversely proportional to the product of charges
C) Directly proportional to distance
D) Independent of charge
Correct Answer: A
1
,Rationale: Coulomb’s law is F = k(q₁q₂)/r²; larger charges
increase force, larger distance decreases force.
3. As you move down a group in the periodic table, atomic
radius generally:
A) Increases
B) Decreases
C) Stays the same
D) Varies randomly
Correct Answer: A
Rationale: Each row adds a new electron shell, increasing the
distance from the nucleus to the outer electrons.
4. Which species has a larger radius: F⁻ or Ne?
A) F⁻
B) Ne
C) Same
D) Depends on isotope
Correct Answer: A
Rationale: F⁻ and Ne are isoelectronic, but F⁻ has fewer protons,
so its electrons are less tightly held.
5. What is the charge of a nucleus that contains 8 protons and
10 neutrons?
2
,A) 8+
B) 10+
C) 2+
D) 0
Correct Answer: A
Rationale: Neutrons are neutral; only protons contribute to
nuclear charge (+8).
6. Which statement about the Bohr model is correct?
A) Electrons orbit in random paths
B) Electrons can have any energy value
C) Electrons exist in fixed energy levels
D) The nucleus contains electrons
Correct Answer: C
Rationale: The Bohr model quantized electron energy into
specific orbits.
7. Which element has the highest first ionization energy in
period 2?
A) Li
B) Be
C) N
D) Ne
3
, Correct Answer: D
Rationale: Ionization energy increases left to right; Ne has the
highest effective nuclear charge.
8. Isotopes of the same element differ in:
A) Number of protons
B) Number of electrons
C) Number of neutrons
D) Atomic number
Correct Answer: C
Rationale: Isotopes have the same proton count but different
neutron counts.
9. Which subatomic particle determines the identity of an
element?
A) Electron
B) Neutron
C) Proton
D) Positron
Correct Answer: C
Rationale: Atomic number = number of protons, which defines
the element.
4
2026 PACKAGE DEAL| MSU CEM 141 EXAM REVIEWS
WITH COMPLETE REAL EXAM QUESTIONS AND
CORRECT VERIFIED ANSWERS/ ALREADY GRADED A+
(MOST RECENT!!)
1. Which subatomic particle has the smallest mass?
A) Proton
B) Neutron
C) Electron
D) Nucleus
Correct Answer: C
Rationale: Electrons have a mass of approximately 1/1836
amu, while protons and neutrons are about 1 amu each.
2. According to Coulomb’s law, the electrostatic force between
two charged particles is:
A) Directly proportional to the product of charges and inversely
proportional to the square of the distance
B) Inversely proportional to the product of charges
C) Directly proportional to distance
D) Independent of charge
Correct Answer: A
1
,Rationale: Coulomb’s law is F = k(q₁q₂)/r²; larger charges
increase force, larger distance decreases force.
3. As you move down a group in the periodic table, atomic
radius generally:
A) Increases
B) Decreases
C) Stays the same
D) Varies randomly
Correct Answer: A
Rationale: Each row adds a new electron shell, increasing the
distance from the nucleus to the outer electrons.
4. Which species has a larger radius: F⁻ or Ne?
A) F⁻
B) Ne
C) Same
D) Depends on isotope
Correct Answer: A
Rationale: F⁻ and Ne are isoelectronic, but F⁻ has fewer protons,
so its electrons are less tightly held.
5. What is the charge of a nucleus that contains 8 protons and
10 neutrons?
2
,A) 8+
B) 10+
C) 2+
D) 0
Correct Answer: A
Rationale: Neutrons are neutral; only protons contribute to
nuclear charge (+8).
6. Which statement about the Bohr model is correct?
A) Electrons orbit in random paths
B) Electrons can have any energy value
C) Electrons exist in fixed energy levels
D) The nucleus contains electrons
Correct Answer: C
Rationale: The Bohr model quantized electron energy into
specific orbits.
7. Which element has the highest first ionization energy in
period 2?
A) Li
B) Be
C) N
D) Ne
3
, Correct Answer: D
Rationale: Ionization energy increases left to right; Ne has the
highest effective nuclear charge.
8. Isotopes of the same element differ in:
A) Number of protons
B) Number of electrons
C) Number of neutrons
D) Atomic number
Correct Answer: C
Rationale: Isotopes have the same proton count but different
neutron counts.
9. Which subatomic particle determines the identity of an
element?
A) Electron
B) Neutron
C) Proton
D) Positron
Correct Answer: C
Rationale: Atomic number = number of protons, which defines
the element.
4
