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What is the coordination number of (...

What is the coordination number of
(i)sodium in sodium oxide `(Na_2O)` ?
(ii)oxide ion in sodium oxide `(Na_2O)` ?
(iii)calcium in calcium fluoride `(CaF_2)` ?
(iv)zinc in zinc blende (ZnS) ?

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(i)4 , (ii)8 , (iii)4 , (iv)4
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