The structure of MgO is similar to NaCl. What is the coordination number of Mg?

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Solution

For sodium chloride, there are $6$ anions around each cation (coordination number of $N a = 6$ ) because of the $1 : 1$ stoichiometry, there must also be $6$ cations around each $C l^{-}$ ion.
Similarly, ${M g}^{2 +} O^{- 2}$ also has the octahedral structure and follows $N a C l$ type geometry. Therefore, the co-ordination number of $M g$ is also $6$ .

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