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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. 8B. 4C. 0D. None of these |
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Answer» Correct Answer - C S=1 t=0 `u=-1/2,1/2` No of subshell=1 , No of orbital=2 No of electrons =8 S=2 t=0,3 `u=-1/2,1/2`(for t=0) u=-2,-1,0,+1,+2(for t=3) No of subshell=2, No of orbital=7 No of electrons=28 S=3 t=0,5,8 `u=-1/2,1/2`(for t=0), u= -3,-2,-1,0,1,2,3 (for t=5) `u= -9/2, -7/2, -5/2, -3/2, -1/2, 1/2, 3/2, 5/2, 7/2, 9/2`(for t=8) No of subshell=3, No of orbital=19 No of electrons =76 (1,0),(2,0),(3,0),(4,0),(2,3)....Energy order of (S,t) For Atomic No. 24 (S+t) rule. There is no electron in S=2,t=3 |
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