If every electron must have a unique set of four quantum numbers, how many different electrons (sets of four quantum numbers) can there be for each principal quantum number from n = 1 to n = 3?

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The quantum numbers of an electron are n (determined by electron's energy), l (angular momentum), `m_l` (one component of angular momentum) and `m_s` (spin, or intrinsic magnetic moment), and they have to obey certain restrictions, which are:

`0 <=l<=n-1` (l is an integer)

`-l<=m_l<=l` (`m_l` is an integer)

`m_s` is a positive or negative half-integer.

So for n = 1, the only...

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