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Bohr made the discovery of electrons traveling in separate orbits around the nucleus in 1912. Bohr made a great contribution to modern physics, which was the atomic model. This model showed the atom as a small, positively charged nucleus surrounded by orbiting electrons.

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Curie was the one that discovered the elements radium and polonium in 1898, in which she carried out the first research into the treatment of tumors with radiation.

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In,1897 during a experiment he successfully deflect a particles which prove that ray is made up of negatively particles. Which is the discovery of electron. "he is a teacher of Rutherford."

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Dalton discovered that all matter is made of atoms and is the one who introduced the atomic theory into chemistry in 1803. He would later on do research into color blindness.

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He came up with the first atomic theory in 400 B.C.E, in which he believed that all matter is made up of small invisible things called " atoms "

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Chadwick is the one who discovered the Neutron in atoms in 1932, which have neither a positive nor negative charge, but does effect the atomic weight.

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In 1911, he overturned J.J Thomson theory by proving in a experiment by demonstrated that the atom has a tiny and heavy nucleus and are surrounded by electron.

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Atomic model of Ernest Rutherford

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Atomic model of J.J Thomson