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Question:

If the principle quantum number n = 6, the correct sequence of filling of electron will be:

ns→np→(n-1)d→(n-2)f

ns→(n-2)f→np→(n-1)d

ns→(n-2)f→(n-1)d→np

ns→(n-1)f→np→(n-2)d

Solution:

If the principle quantum number n = 6, the correct sequence of filling of electron will be ns→(n-2)f→(n-1)d→np.
Here, n=6. Hence, the correct sequence of filling of electron will be 6s→4f→5d→6p.