question_answer 50)

How many electrons in an atom may have the following quantum numbers? (a) \[n=4,{{m}_{s}}=-\frac{1}{2}\] (b) \[n=3,l=0\]  

Answer:

(a) Total number of electrons in a shell \[(n=4)=2{{n}^{2}}=32\] Out of 32 electrons only 16 will have anticlockwise spin \[{{m}_{s}}.\] (b) \[n=3,\,l=0\] denotes 3s-orbital and it has maximum 2 electrons.