Workbook: Quiz 2 Prep #4

Moderators: Chem_Mod, Chem_Admin

Alyssa Chan 3B
Posts: 16
Joined: Wed Sep 21, 2016 2:57 pm

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
Posts: 38
Joined: Fri Jul 15, 2016 3:00 am
Been upvoted: 1 time

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?

Posts: 31
Joined: Wed Sep 21, 2016 2:56 pm

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.

Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

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.

Return to “Electron Configurations for Multi-Electron Atoms”

Who is online

Users browsing this forum: No registered users and 1 guest