In a single atom, what is the maximum number of electrons could have a principal quantum number (n) of 4 and an angular quantum number (l) of 1?

In a single atom, what is the maximum number of electrons could have a principal quantum number (n) of 4 and an angular quantum number (l) of 1? 



(a) 2
(b) 6
(c) 8
(d) 10
(e) 18


Answer: (b) 6


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