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Aufbau Principle

Question

After completion of ‘ $n p$ ’ level, the electron enters into which level according to $(n + p)$ rule?

$(n - 1) d$
$(n + 1) p$
$n d$
$(n + 1) s$

A

(n - 1) d

B

(n + 1) p

C

(n + 1) s

D

n d

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Solution

Verified by Toppr

Energy of nd level would be higher than $(n + 1) s$ .
$n d = n + 2$ , $(n + 1) s = n + 1$ .
So, electron will enter into lower energy level.
i.e, $(n + 1) s$
Let us take an example of $^{'} 4 p^{'}$ orbital. As per Moeller diagram, the orbital that will be filled after $^{'} 4 p^{'}$ orbital is $^{'} 5 s^{'}$ . Hence, $(n + 1) s$ orbital will be filled after $^{'} n p^{'}$ orbital.

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