• Unit 2: The Atom

    The atom, along with its protons, neutrons, and electrons, is the basic unit of matter and serves as our starting point for the study of chemistry. Scientists have studied atoms for hundreds of years and have developed a number of different models to describe them. Chemists currently use the quantum mechanical model, which has been around for decades. The "laws" of this model continue to intrigue and spark debate among scientists. For example, one theory states it is impossible to know the exact location and velocity of an electron at the same time.

    Completing this unit should take you approximately 11 hours.

    • 2.1: Atoms and Elements

    • 2.2: Avogadro's Number and Moles

    • 2.3: Atomic Theories

    • 2.4: The Periodic Table of the Elements

    • Unit 2 Assessment