ACS GENERAL CHEMISTRY EXAM QUESTIONS AND
CORRECT ANSWERS (VERIFIED ANSWERS) Q&A
2027|INSTANT DOWNLOAD PDF
1. Which subatomic particle has a negative charge?
A. Proton
B. Neutron
C. Electron
D. Nucleus
Answer: C. Electron
Rationale: Electrons carry a negative charge, while protons are
positive and neutrons have no charge.
2. What is the atomic number of an element?
A. Number of neutrons
B. Number of protons
C. Number of protons plus neutrons
D. Number of electrons plus neutrons
Answer: B. Number of protons
Rationale: The atomic number uniquely identifies an element
and equals the number of protons in its nucleus.
3. Which particles contribute most of an atom's mass?
,A. Electrons only
B. Protons and neutrons
C. Electrons and protons
D. Electrons and neutrons
Answer: B. Protons and neutrons
Rationale: Protons and neutrons each have masses close to 1
atomic mass unit, whereas electrons have much smaller
masses.
4. Isotopes of an element have different numbers of:
A. Protons
B. Electrons
C. Neutrons
D. Valence electrons
Answer: C. Neutrons
Rationale: Isotopes have the same atomic number but different
numbers of neutrons.
5. Which element has atomic number 8?
A. Carbon
B. Nitrogen
C. Oxygen
D. Fluorine
,Answer: C. Oxygen
Rationale: Oxygen contains eight protons and therefore has an
atomic number of 8.
6. Which element is the most electronegative?
A. Oxygen
B. Chlorine
C. Fluorine
D. Nitrogen
Answer: C. Fluorine
Rationale: Fluorine has the highest electronegativity on the
Pauling scale.
7. Which periodic trend generally increases from left to right
across a period?
A. Atomic radius
B. Metallic character
C. Ionization energy
D. Atomic size
Answer: C. Ionization energy
Rationale: Effective nuclear charge generally increases across a
period, making electrons harder to remove.
8. Which periodic trend generally increases down a group?
, A. Ionization energy
B. Electronegativity
C. Atomic radius
D. Electron affinity magnitude
Answer: C. Atomic radius
Rationale: Additional electron shells are added as one moves
down a group.
9. What type of bond forms primarily through electron
transfer?
A. Covalent
B. Metallic
C. Ionic
D. Hydrogen
Answer: C. Ionic
Rationale: Ionic bonding involves attraction between
oppositely charged ions formed commonly by electron transfer.
10. Which compound contains an ionic bond?
A. H₂O
B. CO₂
C. NaCl
D. CH₄
CORRECT ANSWERS (VERIFIED ANSWERS) Q&A
2027|INSTANT DOWNLOAD PDF
1. Which subatomic particle has a negative charge?
A. Proton
B. Neutron
C. Electron
D. Nucleus
Answer: C. Electron
Rationale: Electrons carry a negative charge, while protons are
positive and neutrons have no charge.
2. What is the atomic number of an element?
A. Number of neutrons
B. Number of protons
C. Number of protons plus neutrons
D. Number of electrons plus neutrons
Answer: B. Number of protons
Rationale: The atomic number uniquely identifies an element
and equals the number of protons in its nucleus.
3. Which particles contribute most of an atom's mass?
,A. Electrons only
B. Protons and neutrons
C. Electrons and protons
D. Electrons and neutrons
Answer: B. Protons and neutrons
Rationale: Protons and neutrons each have masses close to 1
atomic mass unit, whereas electrons have much smaller
masses.
4. Isotopes of an element have different numbers of:
A. Protons
B. Electrons
C. Neutrons
D. Valence electrons
Answer: C. Neutrons
Rationale: Isotopes have the same atomic number but different
numbers of neutrons.
5. Which element has atomic number 8?
A. Carbon
B. Nitrogen
C. Oxygen
D. Fluorine
,Answer: C. Oxygen
Rationale: Oxygen contains eight protons and therefore has an
atomic number of 8.
6. Which element is the most electronegative?
A. Oxygen
B. Chlorine
C. Fluorine
D. Nitrogen
Answer: C. Fluorine
Rationale: Fluorine has the highest electronegativity on the
Pauling scale.
7. Which periodic trend generally increases from left to right
across a period?
A. Atomic radius
B. Metallic character
C. Ionization energy
D. Atomic size
Answer: C. Ionization energy
Rationale: Effective nuclear charge generally increases across a
period, making electrons harder to remove.
8. Which periodic trend generally increases down a group?
, A. Ionization energy
B. Electronegativity
C. Atomic radius
D. Electron affinity magnitude
Answer: C. Atomic radius
Rationale: Additional electron shells are added as one moves
down a group.
9. What type of bond forms primarily through electron
transfer?
A. Covalent
B. Metallic
C. Ionic
D. Hydrogen
Answer: C. Ionic
Rationale: Ionic bonding involves attraction between
oppositely charged ions formed commonly by electron transfer.
10. Which compound contains an ionic bond?
A. H₂O
B. CO₂
C. NaCl
D. CH₄
