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Democritus
Democritus was an Ancient Greek philosopher born in Abdera, Thrace, Greece. A pupil of Leucippus, he was an influential pre-Socratic philosopher who formulated an atomic theory for the universe -
Dalton's Atomic Theory
All matter is composed of extremely small particles called atoms.
Atoms are indivisible and cannot be created or destroyed. -
Antoine Lavoisier
Antoine-Laurent de Lavoisier was a French nobleman and chemist central to the 18th-century Chemical Revolution and a large influence on both the histories of chemistry and biology. He is widely considered to be the "Father of Modern Chemistry. -
Law of Conservation of Mass
Antoine Lavoisier's discovery of the Law of Conservation of Mass led to many new findings in the 19th century. -
John Dalton
John Dalton FRS was an English Chemist, meteorologist and physicist. He is best known for his pioneering work in he develoment of modern atomic theory, and his research into colour blindness. -
Dmitri Mendeleev
Dmitri Ivanovich Mendeleev was a Russian chemist and inventor. He formulated the Periodic Law, created his own version ofthe periodic table of elements, and used it to correct the properties of some. -
Cathode Ray Tybe
Three Electrons gun. Electron beam. Focusing coils. -
JJ Thomson
Sir JJ Thomson was a British physicist. In 1897, Thomson showed that cathode rays were composed of a previously unknown negativly charged particle. -
Plum Pudding Atomic Model
A schematic presentation of the plum pudding model of the atom; in Thomson's mathematical model the "corpuscles" were arranged non-randomly, in rotating rings. -
Robert Millikan
Was an American experimental physicist honored with the Nobel Prize for Physics in 1923 for his measurements of the elementary electronic charge and for bis work on the photoelectric effect. -
Rutherford Model
Rutherford directed the famous Geiger-Marsden experimnet in 1909 which suggested, upon Rutherford's 1911 analysis, that the so-called "plum pudding model' of J.J. Thomson of the atom was incorrect. -
Henry Moseley
Was an English physicist. Moseley outstanding contribution to the science of physics was the previous empirical and chemical concept of the atomic number. -
Bohr Planetary
The Bohr Model is probably familar as the "planetary model" of the atom illustrated in the adjacent figure that, for example, is used as a symbol for atomic energy. -
Niels Bohr
Was a Danish physicist who made foundational contribution to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. -
Gold Foil Experiment
Alpha radiation, which is absorbed by a few thousandths of a centimeter of metal foil, and beta radiation, which can pass through 100 times as much foil before it was absorbed. -
Erwin Schrodinger
Was an Austrian physicist who developed a number of funamental results in the field of quantum theory, which formed the basis of wave mechanics. -
Ernest Rutherford
1st Baron Rutherford of Nelson, was a New Zealand-born physicist and chemist who became known as the father of nuclear physics. He is considered the greatest experimentalist since Michael Faraday. -
Quantum Mechanical Model
Is a branch of physics which deals with physical phenomena at micoscopic scales, where the action is on the order of the Planck constant. -
James Chadwick
Was an English physicist who was awarded the 1935 Nobel Prize in physics for his discovery of the neutronsin 1932. HE was the head of the British scientists who worked on the Manhatten Project during WW2 -
Electron Cloud Model
The electron cloud model is an atom model wherein electrons are no longer depicted as particles moving around the necleus in a fixed orbit.
