2 feb 1913 año - Niels Bohr proposes his theory on the atom
Descripción:
 Niels Bohr is a danish scientist born 1885 and died 1962. He is famous for making a new model of the atom. He proposed that the electrons orbit around the nucleus in rings on different levels. 
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fecha:
2 feb 1913 año
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 ~ 112 years ago