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Which of the following ions have noble gas electron configurations?  

  1. Fe2+ , Fe3+ , Sc3+ , Co3+  
  2. Tl+ , Te2− , Cr3+  
  3. Pu4+ , Ce4+ , Ti4+  
  4. Ba2+ , Pt2+ , Mn2+

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Robert Kubara
Robert KubaraLv10
30 Nov 2020

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