1E.23

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GFolk_1D
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Joined: Fri Aug 09, 2019 12:15 am

1E.23

Postby GFolk_1D » Mon Oct 21, 2019 10:44 pm

The elements Ga, Ge, As, Se, and Br lie in the same period in the periodic table. Write the electron configuration expected from the ground-state atoms of these elements and predict how many unpaired electrons, if any, each atom has.

205296774
Posts: 66
Joined: Thu Jul 25, 2019 12:15 am

Re: 1E.23

Postby 205296774 » Tue Oct 22, 2019 9:17 am

Ga: [Ar] 3d10 4s2 4p1 - 1 unpaired electron
Ge: [Ar] 3d10 4s2 4p2 - 2 unpaired electrons
As: [Ar] 3d10 4s2 4p3 - 3 unpaired electrons
Se: [Ar] 3d10 4s2 4p4 - 2 unpaired electrons
Br: [Ar] 3d10 4s2 4p5 - 1 unpaired electron

Hope this helps!

Chris Tai 1B
Posts: 102
Joined: Sat Aug 24, 2019 12:16 am

Re: 1E.23

Postby Chris Tai 1B » Tue Oct 22, 2019 11:13 am

Here's some reasoning for why the numbers of unpaired electrons exist as they do:

Ga: [Ar] 3d10 4s2 4p1 - 1 unpaired electron, because there's only one electron in the px subshell
Ge: [Ar] 3d10 4s2 4p2 - 2 unpaired electrons, because there's one electron in the px subshell and one in the py subshell.
As: [Ar] 3d10 4s2 4p3 - 3 unpaired electrons, because there's one electron in the px subshell, one in the py subshell, and one in the pz subshell. All are unpaired so far, according to Hund's rule, giving us a total of three unpaired electrons.
Se: [Ar] 3d10 4s2 4p4 - 2 unpaired electrons, because there's a pair of electrons in the px subshell, a single unpaired electron in the py subshell, and a single unpaired electron in the pz subshell.
Br: [Ar] 3d10 4s2 4p5 - 1 unpaired electron, because there is a pair of electrons in both the px and py subshells. There is only one unpaired electron in the pz subshell.


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