The order of filling of electrons in the orbi | vedclass

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(B) According to the Aufbau principle,electrons fill orbitals in the order of increasing energy,which is determined by the $(n + l)$ rule.For the give

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$4s, 3d, 4p, 5s, 4d$

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(B) According to the Aufbau principle,electrons fill orbitals in the order of increasing energy,which is determined by the $(n + l)$ rule.For the given orbitals:$4s: n=4, l=0 \implies n+l = 4$$3d: n=3, l=2 \implies n+l = 5$$4p: n=4, l=1 \implies n+l = 5$$5s: n=5, l=0 \implies n+l = 5$$4d: n=4, l=2 \implies n+l = 6$Comparing the $(n+l)$ values and the $n$ values for orbitals with the same $(n+l)$,the correct order is $4s < 3d < 4p < 5s < 4d$.

The order of filling of electrons in the orbitals of an atom will be

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