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Ans :-
The required chemical equation showing the formation of Barium ion (Ba2+) is :
| Ba (s) ---------------> Ba2+ (aq) + 2e- |
The electronic configuration of neutral Ba (Z=56) atom is = [Xe] 6s2
The electronic configuration of ion Ba2+ showing noble electronic configuration of Xe is = [Xe] 6s0OR [Kr] 4d10 5s2 5p6.
So, Ba2+ shows the noble gas electronic configuration of Xe.
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