Page "Motion (physics)" Paragraph 41

* Within each atom, electrons exist in an area around the nucleus.

This area is called the electron cloud.

According to Bohr's model of the atom, electrons have a high velocity, and the larger the nucleus they are orbiting the faster they would need to move.

If electrons ' move ' about the electron cloud in strict paths the same way planets orbit the sun, then electrons would be required to do so at speeds which far exceed the speed of light.

However, there is no reason that one must confine one's self to this strict conceptualization, that electrons move in paths the same way macroscopic objects do.

Rather one can conceptualize electrons to be ' particles ' that capriciously exist within the bounds of the electron cloud.