Question

In an atom, number of electrons having n=3,l=2 and m=+1 are
A)9
B)4
C)2
D)3

Answer 1

Hello friend

n=3 this means the electrons are present in 3rd shell which has a capacity of holding 18 electrons. l is taking the value 2, it means the electrons are present in the 'd' subshell which can hold 10 electrons. D subshell has values from -2 to 2. It is taking its value as +1 that is 4th orbital of D subshell. The 4th orbital of d shell can accommodate 2 electrons.

So the electrons in a atom having n=3 l=2 and m=+1 are 2

That is option c

If spin quantum is given, whether +1/2 or -1/2 then only one electron of that kind exists.
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If you find any mistakes in my answer then plz get them to my knowledge as I'm not very sure with my answer.

Hope it helped!