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The correct order of increasing energy of atomic orbitals is:
(1) 5p < 4f < 6s < 5d
(2) 5p < 6s < 4f < 5d
(3) 4f < 5p < 5d < 6s
(4) 5p < 5d < 4f < 6s
Ans: 5p < 6s < 4f < 5d
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