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Democritus
Democritus NOTE: Date is in B.C.
Democritus was an ancient Greek philospher, he is known for his influence on science more than any other pre-Socratic philiospher. Democritus is also known as the "Laughing Philospher" for his tendency to laugh at others foolishness. Democritus formulated the first Atomic Theory that was later refined along the years. Democritus claimed that everything is made up of atoms. These atoms are all different shapes and sizes and cannot be created nor destroyed. -
John Dalton
John Dalton
John Dalton proposed the Atomic Theory in 1803, stating all matter was consisted of small particles, called atoms. He also said that there were 3 different types of atoms; simple, compound, and complex. -
JJ Thomson
JJ Thomson
Beginning in 1895 physicist J. J. Thomson theorized that cathode rays produced in Crookes' tubes must be composed of what he called "corpuscles", a single type of negatively charged particle. In 1897, applying his own vacuum technique to the study of these then-mysterious rays, Thomson made a convincing argument for composition based on sub-atomic particles, -
Ernest Rutherford
Ernest Rutherford
Rutherford deflected alpha rays with both electric and magnetic fields in 1903. Rutherford suggested that the simplest possible rays must be those obtained by hydrogen and that these must be the fundamental positively charged particle, which he created the proton. -
Niels Bohr
Niels Bohr
iels Bohr went on to become an accomplished physicist who came up with a revolutionary theory on atomic structures and radiation emission. He won the 1922 Nobel Prize in physics for his ideas and years later, after working on the Manhattan Project in the United States, called for responsible and peaceful applications of atomic energy across the world. -
James Chadwick
James Chadwick
Chadwick's own research focused on radioactivity. In 1919 Rutherford had discovered the proton, a positively charged particle within the atom's nucleus. But they and other researchers were finding that the proton did not seem to be the only particle in the nucleus. Rutherford discovered that atoms have minute and dense nuclei, with the nucleus holding a positive charge in the charge of a hydrogen nucleus. -
Aristotle
Aristotle NOTE: Date is in B.C.
"The roots of education are bitter, but the fruit is sweet."
Aristotle was a very famous Greek philospher who was taught everything he knew by the famous, Plato. Although Aristotle was not technically a scientist by today’s definitions, science was among the subjects that he researched at length during his time at the Lyceum. A
