3d Orbital  [ENDORSED]

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Sabah Islam 1G
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Joined: Sat Jul 22, 2017 3:01 am

3d Orbital

Postby Sabah Islam 1G » Sun Oct 22, 2017 4:01 pm

I understand that the 4s orbital is filled up before the 3d orbital, but why is the 4s orbital filled up before the 3d orbital?

sahiltelang-Discussion 1J
Posts: 50
Joined: Thu Jul 13, 2017 3:00 am

Re: 3d Orbital  [ENDORSED]

Postby sahiltelang-Discussion 1J » Sun Oct 22, 2017 4:32 pm

Atoms always want to be in the lowest energy state possible. Thus it requires less energy for an atom to have electrons in a 4s orbital rather than a 3d orbital. This can get confusing bc 4 is considered a higher energy level.

Jessica Benitez 1K
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

Re: 3d Orbital

Postby Jessica Benitez 1K » Sun Oct 22, 2017 4:44 pm

When we look at the order of elements in the periodic table, we notice that the first two elements in the fourth row are part of the s-block. Therefore, 4s has a lower energy than 3d. However, for multi electron atoms after atomic number 20, 4s has a higher energy than 3d.

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