15h 19min, may 14, 1899 y - Ernest Rutherford proved Dalton wrong
Description:
Ernest Rutherford performed an experiment that separated radiation into three types, the alpha, beta and gamma, based on penetration of objects and ability to cause ionization. Rutherford described the alpha particles to have the lowest penetration of ordinary objects compared to beta and gamma particles.Added to timeline:
Date:
15h 19min, may 14, 1899 y
Now
~ 126 years ago