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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?
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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