Answer:
The last electron is in third shell, so Principal quantum number will be 3 .
The azimuthal quantum no. Can be 0,1,2, but as it is the first electron in last shell so the second quantum no. Will be 0 .
Since the second quantum no. is 0, so the magnetic quantum no. will also be 0.
The spin quantum no. will be +1/2, by hund's rule.
