Big Idea:In 1905, a young Albert Einstein published four groundbreaking theories. One of those theories used Brownian Motion to prove the existence of atoms. This lesson is part one of three describing how we discovered the atomic model used today.
Big Idea:Students always ask me how can we know what at atom looks like if we can't see them. This lesson is part two of three explaining how we developed our modern atomic model using the discovery of the electron.