Period 5 trend

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Fdonovan 3D
Posts: 101
Joined: Sat Aug 17, 2019 12:16 am

Period 5 trend

Postby Fdonovan 3D » Sun Oct 20, 2019 12:49 pm

In period 5, the 4d state has lower energy than the 5s state after 2 electrons have occupied the 5s state. Is there a reason this is the case or is it just one of those things that just is?

Sidharth D 1E
Posts: 98
Joined: Sat Aug 24, 2019 12:17 am

Re: Period 5 trend

Postby Sidharth D 1E » Sun Oct 20, 2019 1:00 pm

Because the principle quantum number of the 4d subshell is less than the principle quantum number of the 5s subshell (4 < 5), the 4d state has lower energy.

Jordan Ziegler 2J
Posts: 59
Joined: Sat Aug 17, 2019 12:15 am

Re: Period 5 trend

Postby Jordan Ziegler 2J » Sun Oct 20, 2019 8:16 pm

The 4d-orbitals also exist closer to the nucleus. I've always thought about it in terms of resisting the positive nuclear charge. If an electron is further away from the nucleus, it needs more energy to resist the attractive charge.


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