An electron can circle a nucleus only in orbits that contain a whole number of de Broglie wavelengths. This statement

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has a few exceptions, but they are not important at a quantum level.

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combines both the particle and wave characters of the electron into a single statement.

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suggests that the uncertainty principle is not correct after all.

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implies that the quantum number, n, is the sum of all the orbits minus the length of the de Broglie wave.

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