2.45 6th Edition

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Beatrice Petelo 1F
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Joined: Fri Sep 28, 2018 12:17 am

2.45 6th Edition

Postby Beatrice Petelo 1F » Tue Oct 30, 2018 7:19 pm

I am a bit confused with part d of this question:

2.45 Which elements are predicted to have the following ground-state electron configurations:
(d) [Rn]7s2 6d2

The solutions manual says that the element with that electron configuration is thorium, but isn't thorium part of the f-block?

Jerome Mercado 2J
Posts: 60
Joined: Tue Nov 28, 2017 3:02 am

Re: 2.45 6th Edition

Postby Jerome Mercado 2J » Tue Oct 30, 2018 9:40 pm

Even though it has electrons in the d - subshell, there are only 4 valence electrons therefore Thorium is the right answer. It would be 7s25f2 but for the first 4 elements in the Actinoid family can interchange between the f or d orbitals due to little difference in energy between orbitals.

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