Philosophers
Aristotle described matter as
being infinitively divisible into smaller and smaller pieces
Bohr discovered/developed
Bohr Model - showed the electons circling around the nucleus in orbits
Democritus
smaller pieces of matter called atoms
in 1932 what did james chadwick discover?
the subatomice partice called the neutron
John Dalton discovered
Atomic Theory - all matter is made of atoms
Thompson discovered
the electrons in 1897
Rutherwood discovered
Atoms are made up of empty space with negatively charged electrons orbiting around a positive core