-
He said the particles that make up matter is an atom.
-
He discovered that atoms are spherical solid masses that are in constant motion.
He said that atoms of a given element posses unique characteristics and weight. -
J.J. Thompson's Cathode ray experiment led to farther experimentation that lead to the worlds first x-ray.
-
He discovered that cathode rays are negatively charged particles which he called 'corpuscles'.
Also mass was about 1000 times smaller than a hydrogen atom.
He described the atom as a ball of positive charge containing a numnber of Electrons. -
Used gold foil experiment to determine that the nucleus of an atom os dense and has a positive charge, thus discovering the proton.
-
He said that the atomic structure was "a successive orbital shell shell of neutrons." He built the Bohr planetary model. This showed how electrons travel in certain orbitals.
-
Francis Aston discovered that for several elements the atomic mass is not the mass of all atoms of the element, therefore discovering what we call the isotope.
-
He identified the electron cloud model as the probable location of many electrons.
-
Chadwick discovered a particle within a nucleous that had a mass similar to the protion. Thus, he discovered the neutron.
-
These two men together split the nucleous of an atom using an accelerated particle accelerator.
-
Two bombs, Little Boy and Fat Man, were dropped on Hiroshima and Nagasaki Japan to end World War 2.
-
Aston's discovery of isotopes led to them being used in CAT scans.
