Niels Bohr (7 oct 1885 año – 18 nov 1962 año)
Descripción:
 -Electrons orbit the nucleus in energy shells or orbits.
-When an electron is in its lowest energy level it is said to be in its ground state.
-Corrected Ernest Rutherford's Atomic Model and called it the Bohr-Rutherford Diagram. 
Añadido al timeline:
fecha:
7 oct 1885 año
18 nov 1962 año
 ~ 77 years
Fotos:
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