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What is the coordination number of sodium in `Na_(2)O`

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What is the coordination number of sodium in `Na_(2)O`
A. 6
B. 4
C. 8
D. 2
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Correct Answer - B
In `Na_(2)O`, each oxide ions `(O^(2-))` is co-ordinated to `8 Na^(+)` ions and each `Na^(+)` ion to 4 oxide ions. Hence if has 4:8 co-ordination.
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