-
Period: 500 to 505
Democritus
1st person to say that matter couldn't be infinitely divided. Coined the term "atoms" & said atoms can not be created, destroyed or further divided. -
Period: 510 to 515
Aristotle
Completely denied the existence of atoms due to his personal ideas about nature -
Period: to
John Dalton
Took Democritus ideas about matter and deviated them based of his personal scientific research. Revived the term "atom" -
J.J Thompson
Designed a series of CRT experiments at Cambridge to determine the ratio of the particle's charge to its mass. -
Period: to
Robert Milikan
Designed an oil drop apparatus to determine the charge of the electron -
Period: to
Ernest Rutherford
Studied how positively charged a- particles interacted with solid matter. Experiment to see if a-particles would be selected as they passed through a thin sheet of gold foil -
Period: to
James Chadwick
Demonstrated that the nucleus had another neutral subatomic particle, the neutron -
Chadwick-Nobel prize
Chadwick won the 1935 Nobel prize for his discovery of the neutron
