CHEM 120 FINAL EXAM AND STUDY GUIDE
(CHAMBERLAIN) NEWEST 2026 TEST BANK| CHEM 120
INTRODUCTION TO GENERAL, ORGANIC &
BIOLOGICAL CHEMISTRY FINAL EXAM REVIEW WITH
650 REAL EXAM QUESTIONS AND CORRECT VERIFIED
ANSWERS/ ALREADY GRADED A+ (MOST RECENT!!)
Question 1
What is the correct number of protons, neutrons, and electrons
in a neutral atom of carbon-14?
A. 6 protons, 8 neutrons, 6 electrons
B. 6 protons, 8 neutrons, 8 electrons
C. 6 protons, 14 neutrons, 6 electrons
D. 14 protons, 6 neutrons, 14 electrons
Correct Answer: A
Rationale: Carbon has atomic number 6 (6 protons). Carbon-14
has mass number 14, so neutrons = 14 - 6 = 8. A neutral atom
has equal protons and electrons (6 electrons).
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,Question 2
Which subatomic particle has a negative charge and
negligible mass?
A. Proton
B. Neutron
C. Electron
D. Positron
Correct Answer: C
Rationale: Electrons have a -1 charge and mass approximately
1/1836 of a proton. Protons are positive, neutrons are neutral.
Question 3
An element has an atomic number of 17. Which group does it
belong to on the periodic table?
A. Alkali metals
B. Alkaline earth metals
C. Halogens
D. Noble gases
Correct Answer: C
2
,Rationale: Atomic number 17 is chlorine (Cl), which is a halogen
(Group 17). Halogens are highly reactive nonmetals with 7
valence electrons.
Question 4
Which isotope is commonly used in carbon dating?
A. Carbon-12
B. Carbon-13
C. Carbon-14
D. Carbon-11
Correct Answer: C
Rationale: Carbon-14 is radioactive with a half-life of 5,730
years, making it useful for dating organic material. Carbon-12
and Carbon-13 are stable.
Question 5
How many valence electrons does oxygen (atomic number 8)
have?
A. 2
B. 4
3
, C. 6
D. 8
Correct Answer: C
Rationale: Oxygen electron configuration is 1s² 2s² 2p⁴. The
valence shell (n=2) contains 6 electrons (2 in 2s, 4 in 2p).
Question 6
Which element is a noble gas?
A. Helium
B. Chlorine
C. Sodium
D. Nitrogen
Correct Answer: A
Rationale: Helium (He) has a full valence shell (2 electrons) and
is inert. Noble gases are Group 18: He, Ne, Ar, Kr, Xe, Rn.
Question 7
What is the mass number of an atom with 20 protons, 20
neutrons, and 20 electrons?
A. 20
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(CHAMBERLAIN) NEWEST 2026 TEST BANK| CHEM 120
INTRODUCTION TO GENERAL, ORGANIC &
BIOLOGICAL CHEMISTRY FINAL EXAM REVIEW WITH
650 REAL EXAM QUESTIONS AND CORRECT VERIFIED
ANSWERS/ ALREADY GRADED A+ (MOST RECENT!!)
Question 1
What is the correct number of protons, neutrons, and electrons
in a neutral atom of carbon-14?
A. 6 protons, 8 neutrons, 6 electrons
B. 6 protons, 8 neutrons, 8 electrons
C. 6 protons, 14 neutrons, 6 electrons
D. 14 protons, 6 neutrons, 14 electrons
Correct Answer: A
Rationale: Carbon has atomic number 6 (6 protons). Carbon-14
has mass number 14, so neutrons = 14 - 6 = 8. A neutral atom
has equal protons and electrons (6 electrons).
1
,Question 2
Which subatomic particle has a negative charge and
negligible mass?
A. Proton
B. Neutron
C. Electron
D. Positron
Correct Answer: C
Rationale: Electrons have a -1 charge and mass approximately
1/1836 of a proton. Protons are positive, neutrons are neutral.
Question 3
An element has an atomic number of 17. Which group does it
belong to on the periodic table?
A. Alkali metals
B. Alkaline earth metals
C. Halogens
D. Noble gases
Correct Answer: C
2
,Rationale: Atomic number 17 is chlorine (Cl), which is a halogen
(Group 17). Halogens are highly reactive nonmetals with 7
valence electrons.
Question 4
Which isotope is commonly used in carbon dating?
A. Carbon-12
B. Carbon-13
C. Carbon-14
D. Carbon-11
Correct Answer: C
Rationale: Carbon-14 is radioactive with a half-life of 5,730
years, making it useful for dating organic material. Carbon-12
and Carbon-13 are stable.
Question 5
How many valence electrons does oxygen (atomic number 8)
have?
A. 2
B. 4
3
, C. 6
D. 8
Correct Answer: C
Rationale: Oxygen electron configuration is 1s² 2s² 2p⁴. The
valence shell (n=2) contains 6 electrons (2 in 2s, 4 in 2p).
Question 6
Which element is a noble gas?
A. Helium
B. Chlorine
C. Sodium
D. Nitrogen
Correct Answer: A
Rationale: Helium (He) has a full valence shell (2 electrons) and
is inert. Noble gases are Group 18: He, Ne, Ar, Kr, Xe, Rn.
Question 7
What is the mass number of an atom with 20 protons, 20
neutrons, and 20 electrons?
A. 20
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