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Period: 460 BCE to 370 BCE
Democritus
His famous atomic theory featuring tiny particles always in motion interacting through collisions this was the discovery in atoms. And that these atoms were the smallest unit of matter and could not be cut. Democritus wrote eloquently on subjects as diverse as the origin of human beings, artistic perspective, mathematics, anthropology, biology, medicine, cosmology, poetry, physics, and atomic theory
https://www.famousscientists.org/democritus/ -
Period: 384 BCE to 322 BCE
Aristotle
Aristotle was a Greek philosopher during the Classical period in Ancient Greece, the founder of the Lyceum and the Peripatetic school.is writings cover many subjects including physics, biology, zoology, metaphysics, logic, ethics, aesthetics, poetry, theatre, music, rhetoric, psychology, linguistics, economics, politics and government. -
Period: to
Benjamin Franklin
Benjamin Franklin was an American polymath and one of the Founding Fathers of the United States. Franklin was a leading writer, printer, political philosopher, politician, Freemason, postmaster, scientist, inventor.Benjamin Franklin was one of most innovative Americans of all time. In deed, his work and experiments resulted in several important discoveries and inventions including electricity, bifocal glasses, a usable battery and many more. -
Period: to
Anton Laurent de La Voisier
The father of Modern Chemistry on quantitative observation to develop conclusions. The Phlogiston Theory by proving that oxygen can cause an combustion. -
Period: to
Joseph Louis Proust
Was a French chemist best known for his discovery of the law constant composition in 1794, stating that chemical compounds always combine in constant proportions. This theory later became known as ''The Law of Definite Proportions.'' -
Period: to
John Dalton
An English chemist and meteorologist best known for introducing the atomic theory into chemistry.Dalton's experiments on gases led to his discovery that the total pressure of a mixture of gases amounted to the sum of the partial pressures that each individual gas exerted while occupying the same space. -
Period: to
Becquerel
Known as Henri Becquerel, was a French physicist who discovered radioactivity, a process in which an atomic nucleus emits particles because it is unstable. The SI unit for radioactivity called the becquerel ,Bq which measures the amount of ionizing radiation that is released when an atom experiences radioactive decay, is also named after Becquerel. -
Period: to
William Crookes
A British chemist and physicist and worked on spectroscopy. Crookes invented 100% ultraviolet blocking sunglass lens. Noted for his discovery of the element thallium and for his cathode-ray studies, fundamental in the development of atomic physics. Atomic physics, the scientific study of the structure of the atom, its energy states, and its Atomic physics, the scientific study of the structure of the atom, its energy states. -
Period: to
Sir John Joseph Thomson
An English physicist and Nobel Laureate in Physics, credited with the discovery and identification of the electron, the first subatomic particle to be discovered. Helped revolutionize the knowledge of atomic structure.JJ Thomson used charged plates to deflect the cathode ray. Found the ray deflected away from the negative plate, and toward the positive. -
Period: to
Curies
Marie Skłodowska Curie was a Polish and naturalized-French physicist and chemist who conducted pioneering research on radioactivity. She was the first woman to win a Nobel Prize, is the only woman to win the Nobel prize twice.research and discoveries In 1895, after Wilhelm Roentgen discovered the existence of X – rays and Henri Becquerel discovered that uranium salts emitted rays that resembled X – rays. -
Period: to
Millikan
American physicist honored with the Nobel Prize for Physics in 1923 for his study of the elementary electronic charge and the photoelectric effect. Photoelectric effect, phenomenon in which electrically charged particles are released from or within a material when it absorbs electromagnetic radiation. The effect is often defined as the ejection of electrons from a metal plate when light falls on it. -
Period: to
Ernest Rutherford
A New Zealand physicist who came to be known as the father of nuclear physics. Discovered alpha and beta rays, and proposed the laws of radioactive decay. Discovered the atomic nucleus. -
Period: to
James Chadwick
James Chadwick discovered the neutron in 1932 and was awarded the Nobel Prize for Physics in 1935. neutron, a nuclear particle with very nearly the same mass as the proton but no electric charge. After this discovery, investigators came to view the nucleus as consisting of protons and neutrons, bound together by a force. -
Period: to 2
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