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[lunar_rose]

Hey guys, if any of you know chem, specifically intermolecular forces and/or isoelectronic species, I have two webassign problems below in a cut that I couldn't get. And seeing as the exam is tomorrow, I would appreciate any enlightenment, however dim it may be.

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[lunar_rose]

Okay, forget the isoelectronic one, I got that now. I missed C and B-, those, also, have identical electronic configurations.