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John dalton
english chemist who proposed the atomic theory which stated that all matter composed of small invisible particles called atoms.
Atomic theory. -
Niels Bohrs
A danish scientist who stated the electrons cloud only orbits around the nucleus.
nobel prize in physics.
bohr model. -
Atomic theory of matter
John Dalton developed the first useful atomic theory of matter around 1803. -
J.J. Thomson
first to measure the electron developed the plum pudding model of the atom described the atom as a slighty sphrere with small electrons inside.
discovered the neutron.
discovered isotopes. -
Plum Pudding model
The plum pudding model was proposed in 1904 before the discovery of the Atomic Nucleus. In this model the atom is composed of electrons through G. J. Stoney proposed that atom of electricity called electrons. in1894. This model was disproved by the gold foil experiment. -
Discovery of the subatomic particle.
Atoms wrer thought to be the smallest the division of matter until 1897 when j.j thompson discovered the electron through his work on cathode rays. A crookes tube is a sealed glass container in which 2 electrodes are separated by a vacuum. When a voltage is carried through the eletrodes, cathode rays are generated. -
Ernest Rutherford
gold foil experiment
nobel prize in chemistry. -
James Chadwick
discovered the neutron
nobel prize in physics.
ernest rutherford was his academic advisor. -
The neutron
James chadwick used alpha particles and discovered a neutral atomic with a mass close to a proton. -
Schrodinger
Discovered the electron cloud.
He identified the electron model as the probable location for moving eletrons. -
Goil foil Experiment
A beam of Alpha particles generated by the radioactive decay of radium was directed normally into a sheet of very thin gold foil. -
Democritus
He said the universe is made of empty space and a nearly infinate number of invisible particles. He stated that atoms are indestructable and they will always be in motion. He was was in Adera, Thrace in 460 BC His main intersest were mathmatics,Astronomy, and Metaphysics.
