Engineering Materials in EE
According to the Bohr model, an electron gains or losses energy only by

 jumping from one allowed orbit to another.
 being completely removed from an atom.
 jumping from one atom to another atom.
 moving faster or slower in an allowed orbit.

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Engineering Materials in EE
The Bohr model of the atom

 explained the color lines in the hydrogen spectrum.
All of these
 had some made-up rules without explanations.
 could not explain the line spectrum of atoms larger than hydrogen.

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