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a
sodium
b
magnesium
c
zinc
d
copper
answer is A.
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Detailed Solution
Sodium (Na) is an example of bcc structure with co-ordination number 8.Zinc (Zn) and Magnesium (Mg) are examples of hexagonal close packing with co-ordination number 12.Copper (Cu) is an example of cubic close packing with co-ordination number 12.