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# ATI TEAS 7 SCIENCE REVIEW: CHEMISTRY
2026/2027 – 150+ HIGH-YIELD QUESTIONS WITH
DETAILED RATIONALES | FIRST-TIME PASS
## Table of Contents
| Section | Topic | Number of 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 Scenarios | 20 |
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# SECTION 1: ATOMIC STRUCTURE & PERIODIC TABLE (20
Questions)
**Q1.** 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, while
electrons and protons are subatomic particles that do not independently
retain elemental properties .
---
**Q2.** Which subatomic particle has a positive charge?
A) Electron
B) Neutron
C) Proton
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D) Ion
**Answer: C) Proton**
*Rationale:* Protons carry a positive charge (+1) and are located in the
nucleus of an atom. Electrons have a negative charge, neutrons are
neutral, and ions are charged atoms .
---
**Q3.** 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 alongside protons. They contribute to atomic mass but do not
affect the atom's electrical charge .
---
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**Q4.** 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 .
---
**Q5.** The mass number of an atom is the sum of:
A) Protons and electrons
B) Protons and neutrons
C) Neutrons and electrons
D) Protons, neutrons, and electrons
**Answer: B) Protons and neutrons**
# ATI TEAS 7 SCIENCE REVIEW: CHEMISTRY
2026/2027 – 150+ HIGH-YIELD QUESTIONS WITH
DETAILED RATIONALES | FIRST-TIME PASS
## Table of Contents
| Section | Topic | Number of 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 Scenarios | 20 |
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# SECTION 1: ATOMIC STRUCTURE & PERIODIC TABLE (20
Questions)
**Q1.** 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, while
electrons and protons are subatomic particles that do not independently
retain elemental properties .
---
**Q2.** Which subatomic particle has a positive charge?
A) Electron
B) Neutron
C) Proton
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D) Ion
**Answer: C) Proton**
*Rationale:* Protons carry a positive charge (+1) and are located in the
nucleus of an atom. Electrons have a negative charge, neutrons are
neutral, and ions are charged atoms .
---
**Q3.** 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 alongside protons. They contribute to atomic mass but do not
affect the atom's electrical charge .
---
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**Q4.** 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 .
---
**Q5.** The mass number of an atom is the sum of:
A) Protons and electrons
B) Protons and neutrons
C) Neutrons and electrons
D) Protons, neutrons, and electrons
**Answer: B) Protons and neutrons**
