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Question
Q143) In the energy level sequence for multi-electron atom, 4f-orbital lies between



SOLUTION

( n+l) value for 4f=(4+3)=7
(n+l) value for 6s=(6+0)=6 thus lower than 4f
(n+l) value for 5d=(5+2)=7
But value of n for 5d is higher than 4f
Answer:(a)