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  4. What is the coordination number of sodium in Na2O ?

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Q. What is the coordination number of sodium in $Na_2O$ ?

The Solid State

Solution:

In $Na_2O , O^{2-}$ ions adopts $f.c.c.$ lattice in which
$Na^+$ ions are present at all tetrahedral sites.
$\therefore $ Co-ordination number of $Na^+$ ion $= 4 $