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300
Aristotle
300 BC
He stated that all matter is made from the four elements: fire, water, air, and earth. He basically stated that there was no such thing as an atom. -
John Dalton
Published his Atomic Theory which states that all matter is composed of atoms, which are small and indivisible. He stated the first atomic model. -
James Maxwell
He proposed electric and magnetic fields filled the void in the atom. -
Marie Curie
She discovered uranium and thorium and discovered two previously unknown elements: radium and polonium. Which are made of atoms. -
Ernst Rutherford
He discovered three different radioactivity: alpha particles (+), beta particles (-) and gamma rays (neutral). With this information and more test he constructed a new atomic model. -
Henery Moseley
He attempts to use x-rays to determine the number of protons in the nucleus of each atom. He was unsuccessful because the neutron had not been discovered yet.