What is the coordination number of sodium in \( \mathrm{Na}_{2} \mathrm{O} \) ? (A) 6 (B) 4 (C) ...

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What is the coordination number of sodium in \( \mathrm{Na}_{2} \mathrm{O} \) ?
(A) 6
(B) 4
(C) 8
(D) 2
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