Question

some are the following sets of quantum numbers are incorrect for 4d electron.which are
a)4,3,2,+1/2
b)4,2,1,0
c)4,2,-2,+1/2
d)4,2,1,-1/2
in my opinion a,b,d are incorrect,but here says that
b,c,d are incorrect.

Answer 1

Oke the first number is the principal quantum number (n).
That's the shell of an electron, in this case thats 4 because in 4d, 4= the shell number

The second number is the azimuthal quantum number (l) which represents the subshell
s=0, p=1, d=2, f=3
We have d here so the second number is 2

The third number is the magnetic quantum number (m)
It's the orientation of the orbital of the electron.
It can be -l to +l (l = the azimuthal quantum number)
l in 4d = 2 so the magnetic number can be -2 -1 0 1 or 2

The fourth number is the spin quantum number (s)
Tells something about the rotation of the electron around it's axis.
It can be +1/2 (clockwise) or -1/2 (anticlockwise)

Now which of the 4 options are incorrect? I can tell you 2 of them are correct.

Answer 2

a,b are incorrect.

Answer 3

in case of a the azimuthal is wrong,and in b the spin cant b 0,but the answers are b,c,d

Answer 4

A and B are incorrect
C and D are correct

Answer 5

thanks,then the answers of my study mat is wrong.

Answer 6

No problem :)