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Democritus called the particles pf matter atoms. Picture credited to: Google,com
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John Dalton said matter is made of spherical solid masses in motion. picture credited to: Google.com
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Wilhelm Roentgen invented the x-ray in 1895
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J.J. Thompson descibed the atom as a ball of positive charge containing a number of electrons.
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Ernest Rutherford used his "gold foil" experiment to determine that the nuecleus of an atom is dense and had a positive charge. Thus, discovering the proton . He assumed that the electrons were outside the nucleus of an atom. Picture creditied to: Google.com
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The first x-ray was used for medical purposes.
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Niels Bohr explained the atomic structure of the atom as "sucessful orbital shells of electrons".His model is known as the Bohr planetary model. picture creditied to: Google.com
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Neils Bohr won a nobel prize for his work with the atomic theory.
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de Broglie and Schrodinger identified the electron cloud as the probable location of moving electrons. picture credited to: Google.com
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James Chadwick discovered a particle with the nucleus that has a mass similar to that of a proton. He is credited with discovering the neutorn. picture credited to: Google.com
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The first atomic bomb waas dropped to end ww II
