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Which one of the following is not isoelectronic with O2- ?

(a) Tl+

(b) Na+ 

(c) N3- 

(d) F-

1 Answer

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Best answer

The correct option is : (a) Tl+

Explanation:

The number of electrons in O2-, N3-, F- and Na+ is 10 each, but number of electrons in Tl+ is 80.

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