-
460 BCE
Democritus
He believed that everything was made up of atoms -
300 BCE
Aristotle
He believed that all of the elements combined such as (earth, water,fire,air) -
1495
Georg Bauer
He made the first scientific classification of minerals -
Robert Boyle
He discovered that elements can be broken down into 2 substances. -
Antoine Lavoisier
Developed the law of conservation of mass and he also named hydrogen and oxygen. -
Joseph Proust
Developed the law of definite proportions -
John Dalton
elements are consist of atoms that have the same mass. The compounds were different elements combined together -
Joseph Gay-Lussac
He made the law of combining volumes -
Amedeo Avogadro
Developed Avogadro's law -
J.J. Thomson
Discovered the first subatomic particle which is the electron -
Henri Becquerel
He discovered that there is invisible radiation that is emitted by uranium -
Robert Millikan
He found that a electron has a negative charge -
Neils Bohr
Made the Bohr model of a atom -
Ernest Rutherford
Found that the nucleus was surrounded by electrons -
Max Planck
Founder of the quantum theory of energy -
Louis de Broglie
Discovered a wave of nature electrons and says that all matter should have wave properties -
Werner Heisenberg
founder of the theory of quantum mechanics -
Erwin Schrodinger
Made the quantum mechanical model of a atom
