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Discovered four "elements"- earth, fire, air, water
Believed in reasoning instead of scientific experiments
Dismissed Democritus' atom idea was "worthless" -
Atomos- indivisible
First to identify possibility of an atom
Smallest piece of matter -
Father of modern atomic theory
5 parts of theory
Includes elements are composed of atoms
Also includes element's atoms are identical in mass -
Discovered electron
Described nature of cathode rays
Plum pudding model of atom -
Atoms can emit "quanta"
Einstein used this scientist's work to study photons -
measured charge of an electron
oil drop experiment
completed with Thomson -
Gold Foil experiment
Atoms has small positive nucleus, remainder is empty space
Predicted existence of neutrons -
Planetary model of atom
Electrons travel in specified energy levels
Spectrum lines produced when electrons move -
Showed mathematically that waves can be used to describe electrons in atoms
Determined probability location of electrons in atoms -
Electrons have properties of both waves and particles
Group of waves named after this scientist -
"uncertainty principle"
impossible to determine the position and the momentum of a particle at the same time
"cloud" model aka quantum mechanical model -
Helped with the development of the nuvlear model
Also discoevered the "neutron"
