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500 BCE
The Alchemist
Alchemists-500BC-1720... increase the theory, that every one metals are composed of mercury and sulfur and that it's far feasible to alternate base metals into gold. -
470 BCE
Democritus
The idea of Democritus held that the whole lot consists of atoms, that are physically, however now no longer geometrically, indivisible; that among atoms, there lies empty space; that atoms are indestructible, and feature usually been and usually can be in motion; that there's an limitless variety of atoms and of sorts of atoms, which range in form and size. Of the mass of atoms, Democritus said, The greater any indivisible exceeds, the heavier it is. However, his actual function on -
427 BCE
Plato
Plato brought the atomic idea wherein best geometric bureaucracy function atoms, in line with which atoms broke down mathematically into triangles, such that the shape factors had the subsequent shape: fire, air , water, earth. However, this become now no longer the atomic idea fully, however instead the 4 detail idea. These shapes got here to be acknowledged as "Platonic Solids." Plato's paintings become a super contribution for similarly improvement of the Atomic Theory -
384 BCE
Aristotle
Aristotle-384-322 BC... Aristotle furnished us with expertise of herbal technology such as Physics, which offers a substantial quantity of facts on astronomy, meteorology, plants, and animals. -
1 BCE
Electron cloud model
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1 BCE
Plum Pudding
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1 BCE
Solar System
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1 BCE
Billiard Bill
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Lavoisier
A later step forward withinside the discovery of the atomic version got here thru the paintings of French chemist Antoine Lavoisier who thru a chain of experiments discovered that the overall mass of merchandise and reactants in a chemical reactions is constantly the same. This caused the theory of the regulation of conservation of mass. -
Robert Boyle
Robert Boyle's principal contribution to the atomic theory become that he helped broaden a definition of an element ( any substance that may be damaged into 2 or greater materials isn't always an element) and helped with " the death" of the 4 elements. Also he helped alternate the manner human beings think about science. -
John Dalton
He is best known for introducing the atomic theory into chemistry, and for his research in his honor. He studied Meteorology, Measuring mountains, color blindness, gas laws, atomic theory.
Elements are fabricated from extraordinarily small debris called atoms.
From 1814 to 1819, Irish chemist William Higgins claimed that Dalton had plagiarized his ideas, but Higgins' theory did not address relative atomic mass -
Dmitri Mendeleev
Mendeleev observed that, while all of the known chemical elements had been organized so as of increasing atomic weight, the ensuing desk displayed a routine pattern, or periodicity, of houses inside agencies of factors. In his model of the periodic desk of 1871, he left gaps in locations wherein he believed unknown factors could discover their place. He even anticipated the possibly houses of 3 of the capacity factors. The next evidence of lots of his predictions inside his lifetime. -
The Curies
French physicists Pierre and Marie Curie observed the strongly radioactive factors polonium and radium, which arise certainly in uranium minerals. Marie coined the time period radioactivity for the spontaneous emission of ionizing, penetrating rays via way of means of certain atoms. -
Ernest Rutherford
A consummate experimentalist, Rutherford (1871–1937) turned into chargeable for a wonderful collection of discoveries withinside the fields of radioactivity and nuclear physics. He located alpha and beta rays, set forth the legal guidelines of radioactive decay, and recognized alpha debris as helium nuclei. Most important, he postulated the nuclear shape of the atom: experiments achieved in Rutherford’s laboratory confirmed that once alpha debris are fired into fueloline atoms. -
J.J. Thomson
J.J. Thomson is credited with the invention of the electron, the negatively charged particle in the atom. He is understood for the Thomson atomic theory. ... In 1904, Thomson proposed a version of the atom as a sphere of advantageous depend with electrons placed primarily based totally on electrostatic forces. -
Albert Einstien
Einstein additionally in 1905 mathematically proved the life of atoms, and as a result helped revolutionize all of the sciences via using data and probability. Atomic theory says that any liquid is made from molecules. Furthermore, those molecules are continually in random, ceaseless motion. -
Neils Bohr
he became a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he acquired the Nobel Prize in Physics in 1922. Bohr became additionally a philosopher and a promoter of clinical research. Bohr evolved the Bohr version of the atom, wherein he proposed that power degrees of electrons are discrete and that the electrons revolve in solid orbits round the atomic nucleus however can bounce from one power level to another. -
Werner Hiesenberg
Rutherford overturned Thomson's version in 1911 together along with his famous gold foil test wherein he verified that the atom has a tiny and heavy nucleus. Rutherford designed an test to apply the alpha debris emitted via way of means of a radioactive detail as probes to the unseen international of atomic structure. -
Robert Millikan
Learn approximately the existence and achievements of American physicist Robert Millikan. His oil drop test helped to quantify the fee of an electron, which contributed significantly to our information of the structure of the atom and atomic theory. -
Henry G. J. Mosely
Henry Moseley turned into an English physicist who contributed to atomic theory and lived from 1887 to 1915. ... This is due to the fact an element's atomic range tells us the range of protons in its nucleus and that range in no way changes, which looks after the hassle delivered on with the aid of using isotopes, that have specific numbers of neutrons.
