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4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is

1. 5f > 6p > 5p > 4d
2. 6p > 5f > 5p > 4d
3. 6p > 5p > 4d > 5f
4. 5f > 6p > 4d > 5p

Correct answer: 5f > 6p > 5p > 4d

Solution

The energy of orbitals is determined by the (n+l) rule, where n is the principal quantum number and l is the azimuthal quantum number. For the given orbitals, 5f (n=5, l=3) > 6p (n=6, l=1) > 5p (n=5, l=1) > 4d (n=4, l=2).

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