What is the coordination number of sodium in Na2O?

  1. A

    6

  2. B

    4

  3. C

    8

  4. D

    2

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    Solution:

    In Na2O there is antifluorite structure. Here negative  ions form the ccp arrangement so that each positive ion is surrounded by 4 negative ions and each negative ion is surrounded by 8 positive ions. So coordination no. of Na+ is 4. 

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