dec 31, 1802 - John Dalton
Description:
Created the modern atomic theory, all matter is made of atoms, all atoms of an element are identical in mass and properties. compounds are formed by a combination of 2 or more different kinds of atoms. A chemical reaction is a rearrangement of atoms.https://courses.lumenlearning.com/introchem/chapter/john-dalton-and-atomic-theory/
Added to timeline:
Date:
dec 31, 1802
Now
~ 223 years ago