
Until the late 1800s, scientists saw the atom much as the ancient Greeks had: as the smallest possible division of matter. Then, J. J. Thomson discovered the electron, establishing the existence of subatomic particles and launching an entirely new field of science, called particle...

Until the late 1800s, scientists saw the atom much as the ancient Greeks had: as the smallest possible division of matter. Then, J. J. Thomson discovered the electron, establishing the existence of subatomic particles and launching an entirely new field of science, called particle...