Important discoveries in chemistry

Democritus

465

source and video
(465 B.C)
First suggested that all matter was made up of atoms.

Antoine Lavoisier

Jan 1, 1743

source and videoStarted the transition from alchemy to chemistry.
Made many other important contributions to chemistry.

Law Of Definite Proportions

Jan 1, 1754

video and source
Joseph Proust showed that a chemical compound always contains the same elements.

Discovery Of Oxygen

Jan 1, 1774

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Joseph Priestley discovered Oxygen and the age old question of how things burn.

Atomic Theory

Jan 1, 1808

Video<a
href='http://www.rsc.org/chemsoc/timeline/pages/1803.html' >source</a>
John Dalton created the atomic theory proposing that all matter is made up of atoms, atoms cannot be created or destroyed, all atoms in the same element are identical, different atoms have different types of atoms

Atoms Combine Into Molecules

Jan 1, 1811

video<a href='http://en.wikipedia.org/wiki/Amedeo_Avogadro' >source</a> Amedeo Avogadro contributed a lot to the molecule theory.

Discovery Of Chemical Structures

Jan 1, 1850

videosourceAugust Kekule came up with the theory of chemical structure, proposing that how the bonds and arrangments in a molecule make different compounds

Periodic Table Of Elements

Jan 1, 1860

videosource
Dmitri Mendeleev organised the 36 known elements into a table by atomic weight.

Discovery Of The Electron

Jan 1, 1897

source J.J Thomson discovered the electron because of electric discharge blocking rays in one of his experiments

Discovery Of The Nucleus

Jan 1, 1909

video
Ernest Rutherford Discovered the nucleus of the atom and that its made up of protons and neutrons source: science 9 textbook

Discovery Of The Relation Between The Nucleus And Electrons

Jan 1, 1913

Niels Bohr discovers that electrons move around a nucleus.

Aristotle

Mar 2, 2022

source (487 B.C)
Pushed for the idea that all matter is made up from air, fire, earth and air.