About This Chapter
How it works:
- Identify the lessons in the Holt Chemistry: Atoms and Moles chapter with which you need help.
- Find the corresponding video lessons within this companion course chapter.
- Watch fun videos that cover the atoms and moles topics you need to learn or review.
- Complete the quizzes to test your understanding.
- If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.
Students will learn:
- The atom
- Early atomic theory
- Mass number and atomic number
- Electron configurations related to atomic energy levels
- Four quantum numbers
- Counting atoms
- Three laws that support the existence of atoms
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1. Early Atomic Theory: Dalton, Thomson, Rutherford and Millikan
Imagine firing a bullet at a piece of tissue paper and having it bounce back at you! You would probably be just as surprised as Rutherford when he discovered the nucleus. In this lesson, we are going to travel back in time and discuss some of the major discoveries in the history of the atom.
2. Atomic Number and Mass Number
Atoms are the basic building blocks of everything around you. In order to really understand how atoms combine to form molecules, it's necessary to be familiar with their structure. In this lesson, we'll dissect atoms so we can see just what really goes into those little building blocks of matter.
3. Electron Configurations in Atomic Energy Levels
This lesson will explain what the electrons are doing inside the atom. Tune in to find out how we specify where they are located and how this location description will help us predict an element's properties.
4. Four Quantum Numbers: Principal, Angular Momentum, Magnetic & Spin
Each electron inside of an atom has its own 'address' that consists of four quantum numbers that communicate a great deal of information about that electron. In this lesson, we will be defining each quantum number and explaining how to write a set of quantum numbers for a specific electron.
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Other chapters within the Holt Chemistry: Online Textbook Help course
- Holt Chemistry Chapter 1: The Science of Chemistry
- Holt Chemistry Chapter 2: Matter and Energy
- Holt Chemistry Chapter 4: The Periodic Table
- Holt Chemistry Chapter 5: Ions and Ionic Compounds
- Holt Chemistry Chapter 6: Covalent Compounds
- Holt Chemistry Chapter 7: The Mole and Chemical Composition
- Holt Chemistry Chapter 8: Chemical Equations and Reactions
- Holt Chemistry Chapter 9: Stoichiometry
- Holt Chemistry Chapter 10: Causes of Change
- Holt Chemistry Chapter 11: States of Matter and Intermolecular Forces
- Holt Chemistry Chapter 12: Gases
- Holt Chemistry Chapter 13: Solutions
- Holt Chemistry Chapter 14: Chemical Equilibrium
- Holt Chemistry Chapter 15: Acids and Bases
- Holt Chemistry Chapter 16: Reaction Rates
- Holt Chemistry Chapter 17: Oxidation, Reduction, and Electrochemistry
- Holt Chemistry Chapter 18: Nuclear Chemistry
- Holt Chemistry Chapter 19: Carbon and Organic Compounds
- Holt Chemistry Chapter 20: Biological Chemistry