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What are the allowed values of angular momentum quantum number (l) in terms of given n (principal quantum number)?

What are the allowed values of angular momentum quantum number (l) in terms of given n (principal quantum number)? Correct Answer l = n – 1

For a given value of n, there are always one less allowed number of total orbital angular momentum quantum numbers. L describes the shape of the orbital (s, p, d, f) in space and forms an important part of how complex atomic functions are depicted mathematically. A complete specification of n, l, and m describes a particular electron in an atom.

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