The number of valence electrons in the $O^{2 -}$ ion is ______.

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Solution

The correct option is B 8
Oxygen has atomic no. 8. Its electronic configuration becomes 2,8,6 i.e it has 6 valence electrons. In $O^{2 -}$ , there are two more electrons. Hence number of valence electrons in the $O^{2 -}$ is 8.

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