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He was a philosopher who was the earliest Greek to develop the theory of atomism—the idea that everything is composed entirely of various imperishable, indivisible elements called atoms. Leucippus often appears as the master to his pupil Democritus, a philosopher also touted as the originator of the atomic theory.
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The theory of Democritus said that everything is composed of "atoms", which are physically indivisible; that between atoms, there lies empty space; that atoms are indestructible, and have always been and always will be in motion; that there is an infinite number of atoms and of kinds of atoms, which differ in shape and size.
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He found that: elements are made of extremely small particles called atoms. Atoms of a given element are identical in size, mass, and other properties; atoms of different elements differ in size, mass, and other properties. Atoms cannot be subdivided, created, or destroyed. Atoms of different elements combine in simple whole-number ratios to form chemical compounds. In chemical reactions, atoms are combined, separated, or rearranged.
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He became known for the discoverer of anode rays, and is sometimes credited with the discovery of the proton.
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In 1897 was the first to suggest that one of the fundamental units was more than 1,000 times smaller than an atom, suggesting the subatomic particle now known as the electron. He also won a Nobel Prize in 1906
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He became known as the father of nuclear physics. He started his research with J.J. Thomson it was about the effect of x-rays in gasses. He won a Nobel Prize in 1908 because of his disovery of the neutron
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When Bohr proposed his atomic model including the electron many of the young scientists and physicists said it was a breakthrough. He also made an institute for theoretical physics
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He was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932. He was knighted in England in 1945 for his achievements in physics.
