Old Chemists

Democritus

460

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

Medevil Alchemy

Jan 1, 1100

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

Oct 21, 1803

John Dalton came up with the atomic theory. The main points were

1. Elements are made up of atoms.
2. The atoms are diffetent from every other element.
3. All atoms of an element are different.
4. All atoms of one element can combine with atoms to form chemical compounds.
5. Atoms cannot be devided.

Source

J.J Thompson

Apr 30, 1867

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

Jan 24, 1896

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

Marie Curie

Jan 1, 1898

She discovered Polonium and Radium and was the first female to be a professor. Source

Pierre Curie

Feb 2, 1898

Discovered polonium and radium with Marie Curie Source

Ernest Rutherford

Jan 1, 1899

During research into radioactivity, he coined the word alpha and beta to describe 2 types of radiation emition. Source

Neils Bohr

Jan 1, 1916

He created the bohr model. This was used to represent the basic structure of an atom. Source

James Chadwick

Jan 1, 1932

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