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In this video I will explain what is “the reduced mass” of an electron. Reduced mass is the effective mass. Because of the interaction when the electron revolves around the nucleus, the nucleus the does not stay in the center when an electron revolves around it. The nucleus (or proton) actually moves in a circle around the center of mass of the atom. The nucleus and the electron will stay at opposite ends of the center of mass of the atom.

Next video in this series can be seen at:
https://youtu.be/LSfwa8_WbVg