Khan Academy: Biology: Chemistry of Life: Electronegativity

Did you know matter is made up of atoms? In this article learn about the smallest unit of matter called the atom.

A video investigating the makeup of an atom. Learn that atoms are composed of protons, neutrons, and electrons. Understand that protons and neutrons determine the mass of an atom. Also, the atomic number gives you the number of protons...

Learn the fundamental properties of atoms in this article. Understand the definition of atomic number, atomic mass, and isotopes. [6 min, 50 sec]

Learn the basics of using electron configuration to put together Lewis structures in this video. Also, explore how valence electrons are involved in creating bonds. [10:56]

Learn the basics of the groups on the periodic table in this video. [8:19]

Learn the basics about the forces between molecules called intermolecular forces in this video. [8:35]

Review over covalent, hydrogen, and ionic bonding in this article. Learn how molecules are held together by chemical bonds.

An article discussing how chemical reactions make and break bonds between atoms.

Learn the basics of chemical reactions in this video. Understand that products and reactants can be reversible or irreversible depending on the reaction. [9:12]

Learn a new technique for representing organic molecule structure called line or line-angle diagram. This technique was created by Khan Academy founder, Sal Khan. [7:28]