Atomic Structure
Overview
Every substance you encounter, from the iron in a bridge to the oxygen you breathe, is made of atoms. These incredibly small particles have an internal structure that determines which element they belong to, how they bond, and how they react. Understanding what sits inside an atom is the starting point for almost all of chemistry.
In this lesson you will learn the difference between atoms and molecules, discover the three sub-atomic particles and where they sit, and master the key terms: atomic number, mass number, and isotope. You will also practise calculating relative atomic mass from isotopic abundance data, a skill tested frequently on Paper 1.
Objectives
- Know what is meant by the terms atom and molecule
- Know the structure of an atom in terms of the positions, relative masses and relative charges of sub-atomic particles
- Know what is meant by the terms: atomic number, mass number, isotopes and relative atomic mass (Ar)
- Be able to calculate the relative atomic mass of an element (Ar) from isotopic abundances
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Atomic Structure. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- What is the atomic number of an element? A) The number of neutrons B) The number of protons C) The number of protons and neutrons D) The number of electrons and neutrons Answer: B
- An atom has 12 protons and a mass number of 24. How many neutrons does it have? A) 12 B) 24 C) 36 D) 6 Answer: A
- Which statement about isotopes is correct? A) They have different numbers of protons B) They have different numbers of electrons C) They have different numbers of neutrons D) They belong to different elements Answer: C
- The relative charge on an electron is: A) +1 B) 0 C) -1 D) -2 Answer: C
- Bromine has two isotopes: Br-79 (50%) and Br-81 (50%). What is the relative atomic mass? A) 79 B) 80 C) 81 D) 160 Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Practice Mock Questions
Want to practice mock questions on Atomic Structure? Download the Green Bridge CBT app to access mock questions and full practice assessments for this topic.
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