Which one of the following ions is not iso-electronic with F~ ?

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Q: 92 (NDA-II/2021)

Which one of the following ions is not iso-electronic with F~ ?

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,3,11,5,4,2,3

keywords: 

{'ions': [0, 0, 0, 3], 'ne': [0, 0, 0, 1]}