-
330
Aristotle
The four element theory was proposed by Aristotle: Earth, Air, Fire and water. -
440
democritus and Leucippus
The idea of the atom where by the democritus and leucippus which is a indivisible particle that all matter is made of. -
Henry Cavendish
Hydrogen was discovered as a colorless, odourless gas by Henry Cavendish. -
Antoine Lavoisier
The first extensive list of elements was made by Antoine Lavoisier with 33 elements which was made up with metals and non-metals -
Lothar Meyer
An early version of a periodic table which was made up with 28 element by Lothar Meyer. -
Dmitri Mendeleev
Dmitri Mendeleev produced a table with 66 known element in it. It was organized by atomic weight. -
William Ramsay
Noble gases was discovered by William Ramsay. -
Henry Moseley
The atomic number of every element was made by Henry Moseley.