According to Neils Bohr-
Ø An atom
consists of a positively charged nucleus around which negatively charged
electrons revolve in different circular orbits.
Ø The
electrons in each permitted orbit have a certain fixed amount of energy. The
larger orbit, the greater is the energy of electrons.
Ø If an
electron is given additional energy (heat, light etc), it is lifted to the
higher orbit. this state does not last long, because the electron soon falls
back to the original lower orbit.
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