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400
Democritus
His major contribution is the propose that the world is made of atoms. He was a greek philospher and many called him "Father of mondern science." He beleived that the atom was unbreakable. -
400
Aristotle
He stated that all substances are made up of 4 elements. Thoes are Fire, Water, Air, and Earth.He was a greek philospher. He beleived in stresses biology. He didn't beleive in math. He indifined that a dolphins are not fish. -
John Dalton
Transformed particles ideas on atoms into a atomic matter. He belevied that all air and water is made of tiny air and water particles called atoms. Atomsof diffrent moliculesncombined in small diffrent ratios to form matter. -
J.J. Thompson
He discovered elections. Conducted cathode rays experiment. -
Robert Millikan
Determined the measurement and charge of the electron. He conducted the oil drop experiment by measuring the effect of an electric feild on very small oil droplets. -
Ernest Rutherford
He discovered the nuclear modle of an atom. The atom is made up of mosty alpha-partiles. The atom contains a nucleus peice at the center. He proved that j.j. Thomson was incorrect, because the atom has a central charge. -
Niels Bohr
His Major Contribution was that electrons circular paths jump aroun the energy levels. He referred to as electrons orbits because elections move around th energy levels like planets around the sun. -
sir james chadwick
He confrimed the existance of nutrons in the outside of the nucules. The atom consits of particle regions. The energy level is the region where electrons in aras of high viosity called mass. Nucleus in the center contains protons and nutrons.
