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370 BCE
Democritus
Democritus was an influential Ancient Greek pre-Socratic philosopher primarily remembered today for his formulation of an atomic theory of the universe. Proposed the Atom and said they were small hard particles. -
350 BCE
Aristotle
Greek philosopher and scientist. A student of Plato and tutor to Alexander the Great, he founded a school outside Athens. He is one of the most influential thinkers in the history of Western thought. His surviving works cover a vast range of subjects, including logic, ethics, metaphysics, politics, natural science, and physics. He thought everything was composed of Earth, Fire, Air, Wind -
Antoine Lavoisier
Lavoisier's most important accomplishment was his role in the dismantling of the phlogiston theory of combustion. Phlogiston was a substance believed to be emitted during combustion and the calcination of metals. Came up with the law of conservation of Mass. -
Joeseph Proust
Joseph Louis Proust was a French chemist. He was best known for his discovery of the law of constant composition in 1794, stating that chemical compounds always combine in constant proportions. Law of definite proportions. -
John Dalton
John Dalton was an English chemist, physicist, and meteorologist. Came up with the law of multiple proportions. 1. All things are made of Atoms. 2. All atoms of a given element are identical. 3.Atoms cannot be divided, created, or destroyed. 4.Atoms combine in whole number ratios too form compounds. 5. In chemical reactions atoms are combined, separated, or rearranged. -
JJ Thomson
Sir Joseph John Thomson was an English physicist and Nobel laureate in physics, credited with the discovery and identification of the electron; and with the discovery of the first subatomic particle. Thought the atom was a solid ball. Discovered an electron. -
Robert Milikan
Robert Andrews Millikan was an American experimental physicist honored with the Nobel Prize for Physics in 1923 for the measurement of the elementary electronic charge and for his work on the photoelectric effect. Disocvered the mass of an electron. -
Ernest Rutherford
Ernest Rutherford, 1st Baron Rutherford of Nelson was a New Zealand-born British physicist who came to be known as the father of nuclear physics. Encyclopædia Britannica considers him to be the greatest experimentalist since Michael Faraday. Discovered the nucleus by conducting the gold foil experiment. -
Niels Bohr
Niels Henrik David Bohr was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922. Bohr was also a philosopher and a promoter of scientific research. Said electrons are found in energy levels. -
James Chadwick
Sir James Chadwick was an English physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932. In 1941, he wrote the final draft of the MAUD Report, which inspired the U.S. government to begin serious atomic bomb research efforts. He was the head of the British team that worked on the Manhattan Project during the Second World War. He discovered the neutron. -
Schrodiner & Heisnberg
Schrödinger and Heisenberg are known to be two of the important founders of quantum mechanics. They both invented a mathematical formalism for quantum mechanics. Schrodinger's formalism which was based on the wave equation was the most popular one.