NEET Chemistry (general) MCQ Question
Which of the following statements correctly describes the filling of orbitals in the sixth and seventh periods of the periodic table?
The sixth period begins with 6s orbital filling followed by 4f, 5d, and 6p, while the seventh period starts with 7s, 5f, 6d, and 7p orbital filling.
The sixth period contains only 32 elements, and the filling of the 4f orbitals occurs after the 6p orbitals are filled.
In the sixth period, the 4f orbitals are filled before the 6s orbitals, while in the seventh period, the 7p orbitals are filled before the 5f orbitals.
Both the sixth and seventh periods contain a maximum of 18 elements each and follow the same orbital filling order.
Correct Answer
Detailed Explanation
The sixth period indeed starts with the filling of the 6s orbital, followed by the 4f, 5d, and 6p orbitals, and the seventh period starts with the filling of the 7s, 5f, 6d, and 7p orbitals. This is consistent with the provided NCERT context.
Found an issue with this question?