Lecture no. 17 from the course: The Joy of Science
Taught by Professor Robert M. Hazen | 30 min | Categories: The Great Courses Plus Online Science Course
While the concept of the atom, the basic building block of all matter, was first proposed at least 2,500 years ago, its existence was not verified until the 20th century. John Dalton presented the first modern statement of the atomic theory. Learn how the discovery of radioactivity and a mathematical demonstration by Einstein provided the compelling evidence.