-
500 BCE
The Alchemist
he developed this theory that all metals are composed of mercury and sulfur. he came up with this theory in 500 BC -
460 BCE
Democritus
he came up with the theory that atoms are made of everything -
427 BCE
Plato
Plato postulated a fifth atomic type exist which was later proven by Aristotle -
5 BCE
Aristotle
this man didn't believe in atoms he believed in in all four elements and that is what they were made of earth wind water and fire -
Robert Boyle
this man here helped make a definition of an element -
Lavoisier
this man found a breakthrough in the atomic model he found that the total mass of products and reactants -
John Dalton
this atomic theory that he came up with states that all matter is composed of atoms -
Dmitri Mendeleev
he found that chemical elements were arranged in order by the atomic weight of it -
The Curies
she discovered that the atoms remain in a constant state -
J.J Thomson
he experiment with cathode ray tubes which he then discovered that all atoms have negative particles -
Albert Einstein
in 1905 he roved the existence of atoms his theory states that any liquid is made of molecules -
Ernest Rutherford
he postulated the nuclear structure of the atom -
Robert Millikan
he began a series of experiments to see the electrical charge in a single electron -
Neils Bohr
he proposed a theory for hydrogen atoms -
Henry G.J. Mosely
he found a relationship between the frequencies of lines that correspond with one another -
Werner Heisenberg
he formulated quantum mechanics in terms of matrices