The Story of Chemistry
Follow our guided path to understand how matter is built, from the atom up to the complex world around us.
Atomic Structure & Bonding
Start your journey here. Learn what atoms are, how they were discovered, how they bond together, and how those bonds create the 3D shapes of molecules.
The Ultimate Guide to Atomic Theory & Bonding
This comprehensive guide covers the history of the atom, the modern quantum model, ionic and covalent bonding, Lewis structures, and VSEPR theory for predicting molecular geometry.
The Periodic Table
With the fundamentals understood, it's time to explore the complete library of atomic building blocks. The Periodic Table organizes every known element by its properties and structure.
The Ultimate Guide to the Periodic Table
Meet the full cast of characters in chemistry. Explore the properties, trends, and secrets of all 118 elements in our fully interactive periodic table.
Or, Dive into an Element Group Guide:
🔥 Alkali Metals
Discover the highly reactive metals in Group 1.
🌍 Alkaline Earth Metals
Learn about the reactive, silvery-white metals in Group 2.
🔗 Transition Metals
Explore the large block of metals known for their strength and colorful compounds.
🔩 Post-Transition Metals
Meet the soft, weak metals that sit between transition metals and metalloids.
🔬 Metalloids
The elements with properties intermediate between metals and nonmetals.
💨 Diatomic Nonmetals
Learn about the "Super Seven" elements that exist as pairs in nature.
🧪 Halogens
The highly reactive "salt-formers" of Group 17.
👑 Noble Gases
The stable, unreactive, and "noble" elements of Group 18.
✨ Lanthanides
The f-block "rare earth" elements essential for modern tech.
☢️ Actinides
The series of radioactive elements at the bottom of the table.
Chemical Arithmetic (Stoichiometry)
Now that you've met the elements and know how they react, it's time to learn the "accounting" of chemistry. Stoichiometry is the science of measuring the amounts of substances involved in chemical reactions.
The Ultimate Guide to Stoichiometry
This comprehensive guide covers balancing equations, the mole concept, molar mass, mole-to-gram conversions, and identifying limiting reactants to calculate theoretical and percent yield.
Aqueous Solutions
Most chemistry happens in water. This unit explores the properties of solutions, concentration, and the behavior of acids and bases.
The Ultimate Guide to Solutions & Acids/Bases
This comprehensive guide covers molarity, dilutions, solution stoichiometry, the pH scale, Brønsted-Lowry theory, and the practical lab technique of titration.