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460
Democritus
Born in 460 BC
He is the father of moden science. He is credidted with coming wp with the theory that everything is made of atmos. Source -
Jan 1, 1100
Medevil Alchemy
Alchemy was revived in the 12th century. The goal was to discover how cosmos can improve mankind. An important substance was the philosiphor's stone. It was believed it can give you imortality and could transform common items to gold. later on it was used in medicine. Source -
John Dalton Atomic Theory
John Dalton came up with the atomic theory. The main points were- Elements are made up of atoms.
- The atoms are diffetent from every other element.
- All atoms of an element are different.
- All atoms of one element can combine with atoms to form chemical compounds.
- Atoms cannot be devided.
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J.J Thompson
Thompson was the first to find there was a unit over 1000 times smaller than an atom. he called them corpuscles. But other scientists prefered the name electrons. Source -
Henri Becquerel
He accidently discovered radioactivity when he wrapped a fluoresent substance on a photographic plate but he found the plates were already exposed. this lead to the discovery of spontanous nuclear radiation. Source -
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Ernest Rutherford
During research into radioactivity, he coined the word alpha and beta to describe 2 types of radiation emition. Source -
Neils Bohr
He created the bohr model. This was used to represent the basic structure of an atom. Source -
James Chadwick
He discoverd the neutron of the atomic. This uas crutial in the fission of uranium 235. The don't need to overcome the coulomb barrier, so the heaviest element can be split. This made it possible to create elements heavier than uranium. Source