□ is just some positive integer, but we give this a special name: the principal quantum number. Where □ is the angular momentum of the electron and ℏ (pronounced “h bar”) is the reduced Planck constant. Specifically, the Bohr model tells us that the angular momentum of an electron in an atom must be equal to a multiple of a constant known as the reduced Planck constant, ℏ. In addition to this, the Bohr model goes one step further: it states that the angular momentum of an orbiting electron is quantized, meaning it can only take specific values.
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