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to n = 2, where n refers to the radial quantum number or principal quantum number of the electron. The transitions are named sequentially by Greek letter: n = 3 to n = 2 is called H-?, 4 to 2 is H-?, 5 to 2 is H-?, and 6 to 2 is H-?. As the first spectral lines associated with this series are located in the visible part of the electromagnetic spectrum, these lines are

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