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In the sixth period, the orbitals that are filled are
- 6s, 5f, 6d, 6p
- 6s, 6p, 6d, 6f
- 6s, 5d, 5f, 6p
- 6s, 4f, 5d, 6p
Correct answer: 6s, 4f, 5d, 6p
Solution
By the Aufbau order, period 6 fills the 6s, then 4f, then 5d, and finally 6p subshells. So the orbitals filled in the sixth period are 6s, 4f, 5d, 6p.
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