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460 BCE
democritus
democrius is know in anti quitity as the alughing pholspher because of his emphasis on the value of cherrfull ness. he was a founder of ancient athomes theroy . he coined the term adam witch is greek for invisible . -
428 BCE
plato
Founder of the Platonist school of thought. Which was the first institution of higher education. Regarded science as a theory. -
385 BCE
airstole
he was one of the gratest philospher and first genuwen sicenctis in history .he didnt belive atomic theory he thught all materials were not made of atoms but of earth , fire ,water , air .he belived all suports were mad up of these 4 elemnets of matter. -
200
solar system modle
Solar System models, especially mechanical models, called orreries, that illustrate the relative positions and motions of the planets and moons in the Solar System have been built for centuries. While they often showed relative sizes, these models were usually not built to scale. -
robert boyle
Robert Boyle FRS was an Anglo-Irish natural philosopher, chemist, physicist, and inventor. Boyle is largely regarded today as the first modern chemist, and therefore one of the founders of modern chemistry, and one of the pioneers of modern experimental scientific method -
lavosier
he obseverd that the mass of reactents in the cotnier before chemicl reaction was euqall to the mass of the products after the reaction .he estblished the law consevtion of mass . this means mass is neither created nor destryoed but only changed .he also discoverd elemnts oxygen carbon nitrgen . -
john dalton
john dalton is best know for the atomic theroy.the theroy is that all matter i madebup of tiny indivisble particalss .he is also know for the law of mutlpie pportion that states that if to elemnets form more then one between them , then the ratio of the masses of the second element wtch combined with a fix mss of the fisrt element withc will always be ratios of small whole numbers .he is know for daltons aw and color blindness. -
Dmitri Mendeleev
A russian chemist and inventor. He is known for formulating the Periodic Law. And he created a farsighted version of the periodic table of elements. -
j.j thomson
jj thomson was credited with the discivery of and elctron . he expermented with cathaotd ray tubes . in his experiment thomson placed to chrge plates on negtive nd one postive and shot a beem thrugh it .the beem titled down toward the postive plate .this justify evedenc of charge showing there must be electrons present . he also discoverd iceatops and someatomic particles. -
robert millikan
He experimented with the oil drop experiment. This determined the mass of 1 electron. 1 electron=1/1840 the mass of a proton. -
Ernest rutherford
he discoverd the necluer modle of the atom .he experimented with the gold foil experiment this experiment showed that there is more inside a atom then aridgling though .a lead block emitted alpha particles at old foil .many o the particall past straigh through but some where delfected in alldiffernt directios .the particals where hiting the middle of the atom . he discover many other things . -
neils bohor
He questioned why the atom didn't collapse? since opposites attract. He discovered the idea of fixed heat. With the expression quantm jumps. He also made the Bohr model. -
Werner Heisenberg
He is know for the Heisenberg uncertainty Principle. This principle states it is impossible to know both the speed and location of the electron. He also made the model of the electron cloud which will only predict an electron location not guarantee it. -
plum putting model
The plum pudding model has electrons surrounded by a volume of positive charge, like negatively-charged "plums" embedded in a positively-charged "pudding". The word "plums" in 19th-century English "plum pudding" is an archaic use of the word; it referred at that time to raisins, not plums -
the cruies
Other scientists hard at work discovering radioactive elements were Polish scientist Marie Curie and her husband Pierre Curie, a French scientist. While working in France at the time of Becquerels discovery, they became very interested in his work. They too suspected that a uranium ore, known as pitchblende, contained other radioactive elements. The Curies started looking for these other elements, and in 1898 they discovered another radioactive element in pitchblende. -
soild spherr of billard ball model
Because Dalton thought atoms were the smallest particles of matter, he envisioned them as solid, hard spheres, like billiard (pool) balls, so he used wooden balls to model them. ... Dalton added these so the model atoms could be joined together with hooks and used to model compounds -
the alchemists
When the first fissures became visible to the naked eye in August 2007, suddenly the most powerful men in the world were three men who were never elected to public office. -
electron cloud model
An electron cloud model is different from the older Bohr atomic model by Niels Bohr. Bohr talked about electrons orbiting the nucleus. ... The electron cloud model says that we cannot know exactly where an electron is at any given time, but the electrons are more likely to be in specific areas
