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Period: 200 to
Scientist Over Time
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460
Democritis
Born in 460 BC in Abdera, north of Greece. He discovered the atomic theory. His work on the atomic structure is relativily close to modern viewpoints. -
John Dalton
Dalton lived in Eaglesfield, England. He believed that atoms were invisible and were reearranged in chemical reactions. His four postulates form Dalton's Atomic Theory. He was also the first to discover color-blindness. -
Sir William Crooke
Crooke lived in London. He created the glass tube to make cathode rays that appeared as a glowing blue light from the interaction of the electric current. -
Dmitri Mendeleev
Mendeleev was born in Tobolsk, Siberia. He formed the first Periodic Table composed of elements arranged in ascending order of atomic weight and grouped them by similar properties. -
John Newlands
He was born in London. Newlands created the Law of Octaves which stated every eighth element has similar properties. His only flaw was that the law only worked up to the element of calcium. He came very close to discovering the periodic table. He also classified elements relative to their atomic masses. -
JJ Thomson
Lived in Manchester, England. He conducted experiments with cathode ray tubes and discovered the electron. He also proposed the plum pudding model of the atom. -
Ernest Rutherford
Rutherford lived in Brightwater, New Zealand. He discovered the nucleus and conducted an experiement using gold foil. -
Niels Bohr
Bohr was born in Copenhagen, Denmark. He discovered that electrons obrit the nucleus at set distances only changing levels when energy is lost or when more energy is obtained. He had his own model called Bohr's Atomic Model. -
Aristotle
Lived in Tharce near Aegean. He discovered that the earth was round and developed the theory of elements. He also had his own Laws of Motion Theory.
