Stock Photo - ATOM, DRAWING<BR>Diagram of Bohr´s circular orbits. According to Bohr, electrons gravitate in circular orbits, each corresponding to a different energy level. For an electron to jump from one orbit to another, it must either receive or emit a certain amount of energy, called a ´quantum´. This is known as the ´quantum leap´.

Stock Photo: ATOM, DRAWING<BR>Diagram of Bohr's circular orbits.  According to Bohr, electrons gravitate in circular orbits, each corresponding to a different energy level.

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