Workbook: Quiz 2 Prep #4

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Alyssa Chan 3B
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Workbook: Quiz 2 Prep #4

Postby Alyssa Chan 3B » Tue Oct 25, 2016 12:22 am

For the electron configuration of Cl- using noble gas abbreviation, should it be [Ne] 3s2 3p6 or simply [Ar]? My high school AP chem teacher taught me the first is the correct configuration and the second is not quite correct. Should the configuration be using [Ne] or are both correct?

Thank you!

Natalie Hunt 1E
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Re: Workbook: Quiz 2 Prep #4

Postby Natalie Hunt 1E » Tue Oct 25, 2016 12:52 am

I had this same question along with a similar one. For Cl2-, because the 3d orbital has slightly more energy than the 4s orbital, does the electron go to the 3d orbital before the 4s orbital making the configuration [Ar] 3d^1?

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Re: Workbook: Quiz 2 Prep #4

Postby Jenny2G » Tue Oct 25, 2016 3:06 pm

For Cl- you can just do [Ar] because it has the exact same electron configuration. When chloride gains an electron it will have full orbitals like the noble gas argon.

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Re: Workbook: Quiz 2 Prep #4

Postby Chem_Mod » Tue Oct 25, 2016 4:47 pm

You would fill the 4s orbital first if you were thinking of Cl2- since 3d is only lower than 4s for elements after Z=20.

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