Assertion :- In H-atom,the energy of 3d-level | vedclass

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Question

(B) In a hydrogen atom ($H$-atom),the energy of an orbital depends only on the principal quantum number $(n)$. Therefore,$3d$ $(n=3)$ has lower energy

Vedclass · Accepted Answer

Both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.

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(B) In a hydrogen atom ($H$-atom),the energy of an orbital depends only on the principal quantum number $(n)$. Therefore,$3d$ $(n=3)$ has lower energy than $4s$ $(n=4)$.However,the Assertion states the energy of $3d$ is smaller than $4s$,which is true for the $H$-atom.The Reason provided describes the $(n+\ell)$ rule,which applies only to multi-electron species,not to the $H$-atom.For the $H$-atom,the energy order is $1s Since the Reason explains the energy order for multi-electron species and not the $H$-atom,it is not the correct explanation for the Assertion.Thus,both statements are true,but the Reason is not the correct explanation for the Assertion.

Assertion :- In $H$-atom,the energy of $3d$-level is smaller than $4s$-level.
Reason :- In multi-electron species,an orbital with lower value of $(n+\ell)$ has energy smaller than the orbital with larger value of $(n+\ell)$.

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Assertion :- In $H$-atom,the energy of $3d$-level is smaller than $4s$-level.Reason :- In multi-electron species,an orbital with lower value of $(n+\ell)$ has energy smaller than the orbital with larger value of $(n+\ell)$.