Confusion on which orbitals fill first

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Confusion on which orbitals fill first

Postby Rachel_Harland_3I » Tue Oct 18, 2016 12:45 pm

the electron configuration for Ta is [Xe]4f14 5d3 6s2
the electron configuration for Au is {Xe]4f14 5d10 6s1

I was wondering if someone could explain the 6s orbital is full for Ta and not for Au
why isn't Ta [Xe]4f14 5d5?
or why isn't Au [Xe] 4f14 5d9 6s2>


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Joined: Wed Sep 21, 2016 2:59 pm

Re: Confusion on which orbitals fill first

Postby Shailyn_Moore_3C » Tue Oct 18, 2016 2:25 pm

This is because initially the 6s state is a lower energy than the 5d which is why it gets filled before 5d but once there are to electrons in the 6s state than and electrons enter the 5d state like La, Hf, Ta, etc. then the 5d is lower which is why it begins fill that state. But anyways Lavelle said that we are only focusing on Period 4 of the f block so don't get to caught up with the other elements. The same rule applies for the 4s and 3d state.

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