12. Calcium has a cubic closest packed structure as a solid. Assuming that calcium has an atomic rad
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12. Calcium has a cubic closest packed structure as a solid. Assuming that calcium has an atomic radius of 197 pm, pleasecalculate the density of solid calcium to be__________ g/cm3 (A) 11.6 (B)1.54 (C) 4.5 (D) 3.38 (E)22.68