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Old Sep 27th 2013, 06:39 AM   #1
ASI7296
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Question d-block configuration?

In the 3d series : Scandium

Configuration: 3d1 4s2

Why isn't it 3d2 4s1?
Since half filled orbitals ( in this case 4s1 ) are more stable?
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Old Sep 27th 2013, 04:33 PM   #2
Kerry
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The Configuration of Scandium would be 1s2, 2s2, 2p6, 3s2, 3p6, 3d1, 4s2
You could also write this as [Ar] 3d1, 4s2

Remember the S orbitals can hold 2 electrons and as the 3d orbitals are at a slightly higher energy level than the 4s orbitals the 4s orbital will fill first, you then fill all the 3d orbitals and then the 4p orbitals.

More information (Diagrams etc.) can be found here: http://www.chemguide.co.uk/atoms/pro...4sproblem.html
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Old Sep 29th 2013, 06:50 PM   #3
JasonHerbalExt
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Thank you, Kerry.

Half filled orbitals are more stalbe. It's plural. That means when both of 3d and 4s are half filled, it's more stable. Look at Chromium (3d5 4s1).

V(3d3 4s2) Cr(3d5 4s1) Mn(3d5 4s2)
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Last edited by JasonHerbalExt; Sep 29th 2013 at 06:56 PM.
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