Answer
a) 1, 0, +1/2, +1/2 - Not acceptable.
c) 2, 2, 1, +1/2 - Not acceptable.
Work Step by Step
a) 1, 0, +1/2, +1/2 - Not acceptable.
Here,
Principal quantum number, n = 1.
Angular momentum quantum number, $l$ = 0.
For an angular quantum number ‘$l$’ , the magnetic quantum number $m_{l}$ can have values ranging from - $l$ through zero to +$l$. So here value of $m_{l}$ is zero, given that $m_{l}$ is +1/2 and magnetic quantum does not have a fractional value.
c) 2, 2, 1, +1/2 - Not acceptable.
Here,
Principal quantum number, n = 2.
For a principal quantum number ‘n’, angular momentum quantum number $l$ can have values ranging from 0 to (n-1). So here possible $l$ values are 0 and 1, given that angular momentum quantum number, $l$ = 2.
