# What is the coordination number of sodium in ${\mathrm{Na}}_{2}\mathrm{O}?$

1. A

6

2. B

4

3. C

8

4. D

2

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### Solution:

In ${\mathrm{Na}}_{2}\mathrm{O}$ 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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