In the sixth period, the orbitals that are filled are:

1) 6s, 5d, 5f, 6p

2) 6s, 4f, 5d, 6p

3) 6s, 6p, 6d, 6f

4) 6s, 5f, 6d, 6p

Solution: (2)

Energy order of orbital’s according to Aufbau principle

6s < 4f < 5d < 6p


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