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370 BCE
Democritus
Primarily remembered for the formulation of the atomic theory, also a pre Socratic philosopher, which means active before the 5th and 6th century. -
332 BCE
Alexander The Great
Was the king of an Ancient Greek Kingdom, he conquered Egypt with his great military knowledge -
300 BCE
Alchemy
Word comes from Khemia which means Egypt, it was the interest in Egyptian religion -
384
Aritotle
Disproved Democritus. Believed in the four elements Earth, Air, Fire, and water -
Anton Lauren de La
Known as the Father of modern chemistry, he relied on quantle observation to develop conclusions -
Ben Franklin
Discovered that electrical charges come in varieties, for example negative and positive. He also created the lightning rod and bifocals which made he become a major figure in the American Enlightment -
Joseph Louis Proust
Created the law of constant composition -
John Dalton
Father of Atomic Theory, his theory states that matter is made up of atoms that are indivisible and indestructible, all atoms of an element are identical, atoms of different elements have different weights and different chemical properties, atoms of different elements combine in simple whole numbers to form compounds, and atoms cannot be created or destroyed. Lastly, when a compound decomposes, the atoms are recovered unchanged. -
William Crookes
Chemist, engaged in psychical research, discovered thallium which helped with the cathode raytube which became a precursor to modern television -
Sir John Joesph Thomson
Continues William Crookes experiments with the cathode ray tube, hanged plates to deflect the cathode ray -
Becquerel
Discovered radio activity in uranium ore, winner of the 1903 Nobel Prize in Physics -
Marie and Pierre Curie
Together discovered and isolated polonium and radium from uranium ores, Becquerel was more successful and won the Nobel prize rather than them -
Millikan
Calculated the mass and charge of an electron -
Ernest Rutherford
Classified radiation, for example alpha-slow, beta-fast, gamma-faster -
James Chadwick
Provided the existence of another subatomic particle, this particle had no charge so he called it a neutron -
Charles M Lieber
Became the chair of the department of Chemistry and Chemical Biology, studied at Harvard with the highest citations
