Atomic Structure
Overview
Every substance you encounter, from the iron in a bridge to the oxygen in your lungs, is built from atoms. These particles are far too small to see, yet understanding their internal structure explains why elements behave the way they do and why the Periodic Table is arranged the way it is.
In this lesson you will learn what atoms and molecules are, explore the subatomic particles inside every atom, use atomic number and mass number to work out proton, neutron and electron counts, and calculate relative atomic mass from isotopic abundances.
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 relative charge of a neutron? A) +1 B) -1 C) 0 D) +2 Answer: C
- An atom has 12 protons and 12 neutrons. What is its mass number? A) 12 B) 24 C) 6 D) 0 Answer: B
- Isotopes of an element always have the same number of: A) Neutrons B) Protons C) Nucleons D) Mass numbers Answer: B
- The relative atomic mass of an element is closest to the mass number of the isotope that: A) Has the most neutrons B) Is most abundant C) Has the fewest protons D) Is radioactive Answer: B
- Where are electrons located in an atom? A) In the nucleus B) Between atoms C) In shells around the nucleus D) Bonded to neutrons Answer: C
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.
Recommended Books
Practice Mock Questions
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