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460 BCE
Democritus
460 BCE- 370 BCE
Remembered today for his formulation of the atomic Theory, some considered him as "The Father of Modern Science", Born in Abdera, Thace, believed to follow the tradition of leueippus, believed everything to be a result of the natural laws, he believed that atoms are tiny, uncuttable, solid particles that are surrounded by empty space and constantly moving at random -
300 BCE
Alchemists
400 BCE - 1400 BCE
There goal was to transmute common elements, like lead, into gold, they believed that's there were seven "base elements", they used symbols to identify elements and made many discoveries that lead to the development of today's chemistry, the two most famous out of the group are Paracelsus, the father of modern pharmacology, cause of work in chemical treatment of ailments and Agricola he described the preparation of sulfuric and nitric acids -
John Dalton
1766-1844
He was a English chemist, physicist, amd meteorologist, best known for his pioneering work in the development of modern atomic Theory and also his research into color blindness sometimes referred to as Daltonism, in his honor -
JJ Thomson
1856-1940
He was an English physicist he showed that cathode rays were composed of previously unknown negatively charged particles, which he calculated has much smaller bodies then atoms, also he is credited with the discovery and identification of the electron and the first subatomic particle and many other findings like those -
Ernest Rutherford
1871 - 1937
A New Zealand physicist wo became the father of nuclear physics he is considered the greatest experimentalist since Michael Faraday, he discovered the concept of radioactive half-lives, proved radioactivity involved the nuclear transmutation of one chemical element to another and later naming it alpha and beta radiation -
Niels Bohr
1885 - 1962
Danish physicist who made contributions to understanding atomic structure and quantum theory of which he received he Nobel prize in physics in 1922, he developed the Bohr model of the atom in which he proposed that energy levels of electron are discreet nd that the electrons revolve in stable orbits around the atomic nucleus but can jump from the one energy level( or orbit) to another
