In the sixth period, the orbitals that are filled are :
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- 6s, 5d, 5f, 6p
- 6s, 4f, 5d, 6p
- 6s, 6p, 6d, 6f
- 6s, 5f, 6d, 6p
The Correct Option is B
Solution and Explanation
6s: 6+0 = 6; 4f: 4+3 = 7; 5d: 5+2 = 7; 6p: 6+1 = 7. After 6s, the 4f (n = 4) is filled before 5d (n = 5), then 6p.
Elements: 6s (2) + 4f (14) + 5d (10) + 6p (6) = 32 elements, matching the sixth period (Cs to Rn).
5f, 6d and 6f belong to the seventh period or later.
Answer: (2) 6s, 4f, 5d, 6p
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