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340
Aristotle
PictureHe was from Greece. Believed in the four elements: Earth, Air, Fire, and Water. -
440
Democratus
PictureDemocratus was from abdera. In 440 BC, he created the 1st model of the atom. He named it the ATOM. -
Period: 440 to
History of the Atom (440 BC-2000)
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Antoine Lavoisier
He was from Paris. He created a common language for all scientist to use. -
John Dalton
He was from England. He created the atomic theory of matter, -
Henri Becquerel
He was from Paris. He discovered Radio-activity. -
J. J Thomson
He was born in England. He said there was small particles in every atom and atoms must ne negative. He proved Daltons theory wrong. -
Marie and Pierre Curie
they are from France. They discovered elements, radium and polonium. Got they idea from Henri Becquerel's radioactivity idea. -
Max Planck
He was from Germany. he said you can measure energy in discrete units. -
Robert Millikan
He was from Europe. He discovered a valvue for electron mass by using the Oil Drop Experiment. -
Ernest Rutherford
He was from New Zealand. He contributed to the absorbtion of radioactiity. (Alpha, Beta, Gamma rays) He also named protons, neutrons, and electrons. -
Neils Bohr
He is danish. He created energy levels and models. Known as the Bohr model. -
Henry Mosely
He was British. He discovered that the frequency of x-rays should depend on the charge of the nucleus. -
Werner Heisenberg
He lived in Germany. He created the theory for structure of coordination complexes. -
Erwin Schrodinger
He was from Austria/Ireland. He discovered quantum mechanics and wave mechanics. -
James Chadwick
He is from England. He discovered the Neutron.
