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300
Demacritus
Discovered that atoms are small and invisiable to the human eye. -
Antoine Lavoisier
He established the law of conservation of mass . He founded a list of elements too. -
joseph Louis Proust
He found the composition of salt. He discovered that it always contained the same weight ratios. -
John Dalton
He ombined atom A with atom B and he also set atomic weights. -
Dmitri Mendeleev
He published the perodic table as Princples of Chemistry with 63 elements. -
Eugene Goldstein
Discovered cahode ays could produce sharp shadows. -
Marie Curie
She discovered new radioactive elements. -
J.J Thomesen
He theorized the cathode rays. -
Earnest Rutherord
Discovered radioativity scale. He also discovered the protron and nucular physics. -
Robert Millikan
Oil drop experiment. Measured electron charges. -
Niels Bohr
Discovered the Planetary model. Atom is illistrated in the adjacent igure. -
Henery Moseley
Measured wavelegnths , positioning of elements on the periodic table. -
James Chadwick
Discovered the Neutron. -
Erwin Schrodinger
Provided theoritical basis for Niels Bohr. He also discovered the movement of an electron in an atom. -
Lise Meitner
Explained and named nuclear fision. Using Bohr's liquid drop.