1|Page
ATI TEAS SCIENCE REVIEW: CHEMISTRY BEST
RATED SOLUTION | 150+ HIGH-YIELD
QUESTIONS WITH DETAILED RATIONALES |
BASED ON ATI TEAS 7 BLUEPRINT 2026-2027
## Table of Contents
| Domain | Topic | Questions |
|--------|-------|-----------|
| 1 | Atomic Structure & Periodic Table | 20 |
| 2 | Chemical Bonding & Molecular Structure | 15 |
| 3 | States of Matter & Phase Changes | 10 |
| 4 | Chemical Reactions & Equations | 20 |
| 5 | Solutions & Concentrations | 15 |
| 6 | Acids, Bases & pH | 15 |
| 7 | Kinetics & Thermodynamics | 10 |
| 8 | Organic Chemistry Basics | 15 |
| 9 | Nuclear Chemistry | 10 |
| 10 | NGN/Case-Based Application | 20 |
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# Section 1: Atomic Structure & Periodic Table (20 Questions)
**Question 1.**
What is the smallest unit of an element that retains the chemical
properties of that element?
A) Molecule
B) Atom
C) Electron
D) Proton
**Answer:** B) Atom
**Rationale:** An atom is the basic unit of matter that retains the
chemical properties of an element. Molecules are combinations of
atoms. Electrons and protons are subatomic particles.
---
**Question 2.**
Which subatomic particle has a positive charge?
A) Electron
B) Neutron
C) Proton
D) Ion
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**Answer:** C) Proton
**Rationale:** Protons are positively charged particles in the nucleus.
Electrons are negatively charged; neutrons are neutral. Ions are charged
atoms.
---
**Question 3.**
Which subatomic particle has a negative charge?
A) Electron
B) Neutron
C) Proton
D) Positron
**Answer:** A) Electron
**Rationale:** Electrons are negatively charged and orbit the nucleus in
electron shells. The number of electrons equals the number of protons in
a neutral atom.
---
**Question 4.**
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Which subatomic particle has no charge (neutral)?
A) Electron
B) Neutron
C) Proton
D) Alpha particle
**Answer:** B) Neutron
**Rationale:** Neutrons are neutral subatomic particles found in the
nucleus. They contribute to atomic mass but not to charge.
---
**Question 5.**
The atomic number of an element is determined by the number of:
A) Neutrons
B) Protons
C) Electrons
D) Nucleons
**Answer:** B) Protons
**Rationale:** The atomic number (Z) equals the number of protons in
the nucleus. This uniquely identifies the element. In a neutral atom, the
number of electrons equals the number of protons.
ATI TEAS SCIENCE REVIEW: CHEMISTRY BEST
RATED SOLUTION | 150+ HIGH-YIELD
QUESTIONS WITH DETAILED RATIONALES |
BASED ON ATI TEAS 7 BLUEPRINT 2026-2027
## Table of Contents
| Domain | Topic | Questions |
|--------|-------|-----------|
| 1 | Atomic Structure & Periodic Table | 20 |
| 2 | Chemical Bonding & Molecular Structure | 15 |
| 3 | States of Matter & Phase Changes | 10 |
| 4 | Chemical Reactions & Equations | 20 |
| 5 | Solutions & Concentrations | 15 |
| 6 | Acids, Bases & pH | 15 |
| 7 | Kinetics & Thermodynamics | 10 |
| 8 | Organic Chemistry Basics | 15 |
| 9 | Nuclear Chemistry | 10 |
| 10 | NGN/Case-Based Application | 20 |
,2|Page
# Section 1: Atomic Structure & Periodic Table (20 Questions)
**Question 1.**
What is the smallest unit of an element that retains the chemical
properties of that element?
A) Molecule
B) Atom
C) Electron
D) Proton
**Answer:** B) Atom
**Rationale:** An atom is the basic unit of matter that retains the
chemical properties of an element. Molecules are combinations of
atoms. Electrons and protons are subatomic particles.
---
**Question 2.**
Which subatomic particle has a positive charge?
A) Electron
B) Neutron
C) Proton
D) Ion
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**Answer:** C) Proton
**Rationale:** Protons are positively charged particles in the nucleus.
Electrons are negatively charged; neutrons are neutral. Ions are charged
atoms.
---
**Question 3.**
Which subatomic particle has a negative charge?
A) Electron
B) Neutron
C) Proton
D) Positron
**Answer:** A) Electron
**Rationale:** Electrons are negatively charged and orbit the nucleus in
electron shells. The number of electrons equals the number of protons in
a neutral atom.
---
**Question 4.**
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Which subatomic particle has no charge (neutral)?
A) Electron
B) Neutron
C) Proton
D) Alpha particle
**Answer:** B) Neutron
**Rationale:** Neutrons are neutral subatomic particles found in the
nucleus. They contribute to atomic mass but not to charge.
---
**Question 5.**
The atomic number of an element is determined by the number of:
A) Neutrons
B) Protons
C) Electrons
D) Nucleons
**Answer:** B) Protons
**Rationale:** The atomic number (Z) equals the number of protons in
the nucleus. This uniquely identifies the element. In a neutral atom, the
number of electrons equals the number of protons.
