Which orbital has highest energy?

Chemistry Level 2

For an F e Fe atom at its ground state, which orbital is filled with electrons that has highest energy?

4 d 4d 3 d 3d 3 s 3s 4 s 4s

Alice Smith by Alice Smith , 20, China

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1 solution

Alice Smith
Apr 20, 2020

Further explanation see here

Qn: Woah. Wait, then why after filling the 3d orbitals, the 4s becomes higher in energy level?

Ans: Once 3d orbitals are occupied by electrons, like in the case of transition elements, because they are closer to the nucleus, they will repel the 4s electrons further away from the nucleus and cause it to have higher energy level. So this explains why even though we fill the 4s before 3d orbitals, we will still ionize 4s electrons before 3d electrons.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

It's very wrong pal. 3d orbitals have higher energy.

Tibrôncio Cavalcante - 1 year ago

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I think I should change the wording in this problem. Although for a empty orbital, 3d has highest energy, however, when filled with electrons, the electron of the 4s orbital has highest energy.

Alice Smith - 11 months ago

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