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400
Democritus
Everything is composed of atoms, which are physically, not geometrically, invisible. He said that between atoms there is ann open space inbetween. -
400
Plato
He believed that the sun, stars, and planets were all made of atoms -
Alchemisits
They saw matter, as made up of three elements. -
Robert Boyle
He proposed that some substances couldnt be broken down any further by chemical method. -
Lavoisier
He proposed the combustion theory. -
John Dalton
He preformed a number of experiments that led to the acceptance of the atom. -
Demitri Mendeleev
He developed the first periodic tabe -
The Curies
The Curies founded Uranium -
J.J. Thomson
He provided the first hint that atoms are made of even smaller particles. -
Albert Einstein
He mathematically proved the existence of atoms. -
Ernest Rutherford
He discovered electrons circling around the nucleus. -
Henry G. J. Mosely
He rearenged the atomic table by reararanging by atomic number. -
Neils Bohr
He developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up sucessive orbital shells of electrons.
