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500 BCE
The Alchemists
Matter is made from small particles and they are in constant motion. They were conducting the first attempts of chemistry.
https://healthresearchfunding.org/alchemists-atomic-theory-explained/ -
Robert Boyle
Develop a definition of an element. If that any substance that can be broken into 2 or more substances is not an element).
https://sites.google.com/site/robertboyletheskepticalchemist/atomic-theory-contribution -
Antione Lavoisier
Sample Fact Link -
John Dalton
Everything is composed of atoms, which are the indivisible building blocks of matter and cannot be destroyed. All atoms of an element are identical. The atoms of different elements vary in size and mass.
https://courses.lumenlearning.com/introchem/chapter/john-dalton-and-atomic-theory/#:~:text=Dalton's%20atomic%20theory%20proposed%20that,of%20differing%20size%20and%20mass. -
Neils Bohr
Sample
