Question

Explain why the quantum number set (3,2,-3,+1/2) is not possible for an electron in a ground state atom

Answer 1

Answer:

The electron spin can only take place in opposite directions.

Explanation:

The angular momentum of a quantum number deals with the shape of the atomic orbital. Each orbital has a specific shape. In addition, the electrons have specific spin directions. let's say a quantum number, m is having two three shells. It means that:

number of shells, n = 3.

The level will be 3

the possible spins will be 0, 1, 2.

This takes place in the negative direction as well to give:

-2 , -1, 0, 1, 2

Thus, 3,2,-3,+1/2 cannot be a quantum number as it does not have a equal and opposite spin.  

Answer 2

L = an integer from 0 to n-1 
mL = an integer from -L to +L 
ms = + or - 1/2 

the format is (n, L, mL, ms) 

so your 
n = 3... this is OK 
L = 2.. also OK.. if n=3, L can = 0, 1, or 2 
mL = -3 is NOT ok... if L=2.. mL can only be -2, -1, 0, +1, or +2 
ms = +1/2 and that is ok

Hope this helps!