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384
Aristole
Aristole was born in Greece, and stated that all substances were made out of the 4 element earth, fire, water, and air. Hedied at age 62, after being brought up by a guardian when his father died when he was a baby. -
460
Democritus
Democritus was born in Greece, and lived to be the age 90. He was the one who first proposed the idea of an atom. He traveled the world after his father's death, and in doing so, discovered many things that formed the base of the atom. -
John Dalton
John Dalton wa born in the UK, and he transformed Democritus's ideas on atoms into a proper atomic theory. HIs theory said that atoms were unbreakable, and they differed according to their elements. He died in 1940. -
J. J. Tompson
J. J. Tompson was born in he UK, and made a major contribution to atomic science by discovering the electron. He also performed a experiment called the 'Cathode Ray Tube' to find out whether electrons were positive or negative. -
Robert Millikan
Robert Millikan was born in Illinois, and was the one who determined the charge and the weight of an atom using an experiment called 'The OIl Drop.' He determined from the weight of an atom in the experiment the electric charge on an atom. -
Ernest Rutherford
Ernest Rutherford discovered Alpha and Bata rays using the 'Gold Foil Experiment.' He found out that an atom is made up of mostly empty space, and that an atom contains a positively charged piece in the center. He died in 1937. -
Neils Bohr
Neils Bohr was born in Denmark, and discovered that an electron is only found in specific circular paths, or orbits, around the nucleus. He made the first model of an atom, which has still stuck around until today. He died in 1962. -
Sir James Chadwick
Sir James Chadwick was born in the UK, and he discovered the existence of the neutron in the nucleus. He was the one who led to the modern view of the atom. He died in 1974
