Question:

If the principal quantum number n = 6, the correct sequence of filling of electrons will be:

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Apply the (n+l) rule for n = 6 and compare 6s, 4f, 5d, 6p.
Updated On: Nov 11, 2026
  • \(ns\rightarrow(n-1)d\rightarrow(n-2)f\rightarrow np\)
  • \(ns\rightarrow np\rightarrow(n-1)d\rightarrow(n-2)f\)
  • \(ns\rightarrow(n-2)f\rightarrow np\rightarrow(n-1)d\)
  • \(ns\rightarrow(n-2)f\rightarrow(n-1)d\rightarrow np\)
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The Correct Option is D

Solution and Explanation

By the (n+l) rule: 6s (6+0=6), 4f (4+3=7), 5d (5+2=7), 6p (6+1=7). Lower n+l fills first; for equal n+l, lower n fills first.
Order: 6s, then 4f (n=4), then 5d (n=5), then 6p (n=6).
That is \(ns\rightarrow(n-2)f\rightarrow(n-1)d\rightarrow np\).
Answer: (4) \(ns\rightarrow(n-2)f\rightarrow(n-1)d\rightarrow np\)
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