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If n = 6, the correct sequence for filling of electrons will be:

1. ns - (n-2) f - (n-1) d - np
2. ns - (n-1) d - (n-2)f - np
3. ns - (n-2)f - np - (n-1) d
4. ns - np - (n-1) d - (n-2)f

Correct answer: ns - (n-2) f - (n-1) d - np

Solution

The correct sequence for filling electrons is based on the Aufbau principle, which states that orbitals are filled in order of increasing energy. For n=6, the sequence is ns → (n-2)f → (n-1)d → np.

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