which orbital has lower energy 4d or 5f

Dear Student,

According to Aufbau Principle, which is also known as n+l rule. The n+l value of the above given orbitals are:
  • 4d:
          n = 4
           l = 2
     n + l = 6
  • 5f:
          n = 5
           l = 3
     n + l = 8

Now, as we can see that n + l value of 4d-orbital is less so it will have a lower energy than 5d-orbital and thus electrons will firstly be filled in 4d-orbital then in 5f-orbital (according to Aufbau Principle).

Hope this information clears your doubts about the topic.

Keep asking!!

Regards

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