In which of the following structures, the anion has maximum coordination number? (a) \( \mathrm{...

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In which of the following structures, the anion has maximum coordination number?
(a) \( \mathrm{NaCl} \)
(b) \( \mathrm{ZnS} \)
(c) \( \mathrm{CaF}_{2} \)
(d) \( \mathrm{Na}_{2} \mathrm{O} \)
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