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4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is:
A
5f > 6p > 5p > 4d
B
6p > 5f > 5p > 4d
C
6p > 5f > 4d > 5p
D
5f > 6p > 4d > 5p
Detailed Solution
Using the $(n+l)$ rule:
4d = 4 + 2 = 6; 5p = 5 + 1 = 6; 5f = 5 + 3 = 8; 6p = 6 + 1 = 7
For equal $(n+l)$, higher n has higher energy, so 5p > 4d.
Order of decreasing energy: 5f > 6p > 5p > 4d