1 jan 1913 ano - Niels Bohr

Descrição:

He proposed that electrons move in circular orbits around the nucleus . Electrons closer to the nucleus have less energy than electrons farther away. When energy is added to the atom, electrons gain energy and move from a lower energy level to a higher energy level. When they return to lower energy level, they release a specific amount of energy. He made his discovery experimenting with hydrogen atoms.

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