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Atomic Theory & Structure - Chapter Summary
These lessons explain early atomic theories and discuss how modern atomic theory has evolved from these original concepts. You'll also look at how to locate elements and valence electrons on the periodic table and review Avogadro's number and how it is used to count atoms. After viewing these lessons, you should know how to:
- Define what an atom is
- Describe isotopes and average atomic mass
- Differentiate between molecular weight and equivalent weight
- Explain the basics of quantum numbers
With these short, fun video and text lessons, you can boost your comprehension of even the most challenging topics with ease. Our professional instructors have created these materials in order to make studying easy and interesting. The lesson quizzes make excellent test prep tools to help you gauge how well you'd do on an upcoming test. Use the quizzes to identify which areas of study need more work, then go back and review those lessons as many times as needed.
1. The Atom
Tune into this lesson to find out what matters about matter. What exactly is an atom? And, how do the atoms that make up the elements in the periodic table differ from one another?
2. 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.
3. Modern Atomic Theory: Electron Clouds, Schrodinger & Heisenberg
Does an atom look more like a solar system or a cloud? Learn how the early atomic theory has evolved into the modern atomic theory and changed the way science views the atom. Learn about contributions from Schrodinger and Heisenberg.
4. Isotopes and Average Atomic Mass
When you drink a glass of water, you are actually drinking a combination of heavy water and light water. What's the difference? Is it harmful? This video will explain the difference between the two types of water and go into detail on the significance of the different isotopes of elements.
5. Molecular Weight: Definition & Formula
In this lesson, we will learn about molecular weight, which is the mass of a molecule determined by summing the masses of all of the atoms that make it up. We will look at the formula for determining molecular weight, learn where to find atomic masses on the periodic table, and do an example calculation.
6. Equivalent Weight: Definition & Formula
In chemistry, there are different ways to express the weights of different compounds. In this lesson, we will learn how to determine the equivalent weight of a compound.
7. Valence Electrons and Energy Levels of Atoms of Elements
The periodic table contains a wealth of information. This lesson will explain how to use it to quickly determine the most useful information about the most important electrons. We will be focusing our discussion on valence electrons and energy levels.
8. Avogadro's Number: Using the Mole to Count Atoms
How do we move from the atomic world to the regular world? Because atoms are so tiny, how can we count and measure them? And what do chemists celebrate at 6:02 AM on October 23rd each year? In this lesson, you will be learning how Avogadro's number and the mole can answer these questions.
9. Atomic Structures: Pauli Exclusion Principle, Aufbau Principle & Hund's Rule
This lesson discusses the three main rules that govern how electrons fit in the atomic structure by filling the shells, subshells, and orbitals. We will also review the basics of quantum numbers before learning these principles.
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