Question

4s orbital has less energy than 3d orbital. Justify.

Answer 1

Use n+l rule,l is azimuthal quantum number
4s=4+0=4
3d =3+2=5

Answer 2

Hope it helps...!!!!

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Energy of 4s orbital is less than 3d orbital because energy is governed by (n+l) rule.

For 4s ,n=4 and l=0.

For 3d ,n=3 and l=2.

So (n+l) for 4s is less than 3d.

So it has a lower energy than 3d orbital.

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