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Jan 1, 1501
Democritus 460 BC to 370 BC
Democritus - developed a new theory of matter that attempted to overcome the problems of his predecessor. Atomic Models Democritus author of this model, lived from 460 BC to 370 BC. -
antoine lavoisier
He named both oxygen and hydrogen and predicted silicon. -
John Dalton (1766-1844)
Dalton concluded that evaporated water exists in air as an independent gas. -
Dmitri Mendeleev
He is credited as being the creator of the first version of the periodic table of elements. -
J.J. Thomson 12/18/1856 to August 30, 1940,
J.J. Thomson He advanced the idea that cathode rays are really streams of very small pieces of atoms. The plum pudding model of the atom by J. J. Thomson he found the electron in 1897, was shown in 1904 before the discovery of the atomic nucleus in order to add the electron to the atomic model. -
Robert millikan
measurement of the charge on the electron and for his work on the photoelectric effect. -
Ernest Rutherford
chemist and physicist who became known as the father of nuclear physics. -
Erwin Schrödinger
he maid the waves mechanics -
henry moseley
physical laws of the previous empirical and chemical concept of the atomic number for sceince -
james chadwick
he's discovery of the neutron. -
Niels Bohr
who made foundational contributions to understanding atomic structure and quantum mechanics.
