(a) Principal quantum no. n is de6ned as 1, 2, 3.... 
(b) Azimuthal quantum no.l is defined as 1 lo n + 2 in 
integral steps.
(c) Magnetic quantum no. m is defined -l/2 to l/2 (including zero, if any, in integral steps). 
(d) Spin quantum no. s has six possible values (
-2,-1, - 1/2,+1,+2)
(e)The subsell corresponding to l=1,2,3,4,5,.....
designated as F, G, H, I, J, k.... respectively.

(f) The values of m for a given values of l give the number of orbitals in a sub-shell.
(g) The principle for filling of  ${\mathrm{e}}^{-}$ in the shells remains unchanged.

The no. of orbitals and maximum no. of ${\mathrm{e}}^{-}$that can be filled in a J-subshell respectively will be :