Instead of principle quantum number (n), azimuthal quantum number (L) &magnetic quqntum number m,
a set of new quantum number s, t & u was introduce with similar logic but different value as defind
below
`s=1,2,3,...........oo` all positive integral values.
`t=(s^(2)-1^(1)),(s^(2)-2^(2)),(s^(2)-3^(3))`......... No negative value
`u=((t+1))/2"to"+((t+1))/2`(including zero , if any ) in integaral step .
Each orbital can have maximum four electrons .
(s+t) rule is defined ,similar to (n+l) rule.
Number of electronc for which s=2,t= 3 for an element with atomic number 24.
A. 8
B. 4
C. 0
D. None of these