what is the corrdination number of (i) Sodium in sodium oxide ( Na_(2)O) ?(ii)oxide ion in sodim oxide (Na_(2)O) ? (iii) Calcium in calcium fluoride(CaF_(2))? (iv) Zinc in zinc blende (ZnS) ?

what is the corrdination number of (i) Sodium in sodium oxide ( Na_(2)

1.	what is the corrdination number of (i) Sodium in sodium oxide ( Na_(2)O) ?(ii)oxide ion in sodim oxide (Na_(2)O) ? (iii) Calcium in calcium fluoride(CaF_(2))? (iv) Zinc in zinc blende (ZnS) ?
Answer» Solution :(i) 4 (II) 8 (III)8 (iv)4(v) 4.