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NABTEB Chemistry Past Questions.

Published on Aug 14, 2025 • Education

Introduction

Hello students, and welcome to today’s NABTEB Chemistry tutorial. My name is Ade Banke, and I will be guiding you through real NABTEB Chemistry past questions with detailed explanations. This lesson will help you master atomic structure, atomic mass number, and nuclear charge, ensuring you’re fully prepared for your NABTEB examinations.

Let’s get started with the questions and answers.

Question 1 – What is an Atom?

From the diagram provided, we can clearly see the structure of an atom.

Definition:
An atom is the smallest particle of matter, made up of protons, electrons, and neutrons.

• A. The largest unit of matter made up of electrons only
• B. The smallest particle of matter made up of electrons, protons, and neutrons
• C. A particle made up of only protons and neutrons
• D. A unit of energy

Correct Answer: B – The smallest particle of matter made up of electrons (negatively charged), protons (positively charged), and neutrons (neutral).

Why Not the Others?

• Option A is wrong because electrons alone cannot form matter.
• Option C is incomplete because it leaves out electrons.
• Option D is incorrect; an atom is not a unit of energy.

Question 2 – What Does the Atomic Mass Number Represent?

Definition:
The atomic mass number is the sum of protons and neutrons in an atom. Both are located in the nucleus.

• A. The number of electrons only
• B. The sum of protons and neutrons in an atom
• C. The charge of the nucleus
• D. The number of neutrons only

Correct Answer: B – The atomic mass number equals the total number of positively charged protons plus neutral neutrons in the nucleus.

Exam Tip:
Electrons are not counted in the atomic mass number because their mass is negligible.

Question 3 – What is Nuclear Charge?

Definition:
The nuclear charge is determined by the number of protons in the nucleus of an atom.

Since neutrons are neutral (no charge) and both protons and neutrons reside in the nucleus, the nuclear charge comes solely from protons.

• A. Sum of protons and neutrons in the nucleus
• B. The charge of the electrons in the atom
• C. The total number of protons in the nucleus
• D. The total number of neutrons only

Correct Answer: C – Nuclear charge equals the positive charge contributed by protons in the nucleus.

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Conclusion – Mastering NABTEB Chemistry for Exam Success.

Understanding the fundamental concepts of Chemistry, such as atomic structure, atomic mass number, and nuclear charge, is essential for excelling in the NABTEB examination. These topics not only form the foundation for more advanced chemistry concepts but also frequently appear in NABTEB past questions.

By practicing with real past questions and studying detailed explanations like the ones provided in this tutorial, you’ll build confidence, improve accuracy, and reduce mistakes during the exam. Remember to focus on the definitions, formulae, and reasoning steps behind each correct answer — this is what separates a guess from a guaranteed mark.

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Key NABTEB Chemistry.

• NABTEB Chemistry past questions
• Atomic structure
• Atomic mass number
• Nuclear charge
• Protons, electrons, and neutrons
• Chemistry exam preparation
• Chemistry objective questions with answers
• NABTEB Chemistry tutorial