(1) Calculate the edge length

$\mathbf{a}\mathbf{}\mathbf{=}\mathbf{}\mathbf{2}\sqrt{\mathbf{2}}\mathbf{}\mathbf{\xb7}\mathbf{r}\phantom{\rule{0ex}{0ex}}\mathbf{a}\mathbf{}\mathbf{=}\mathbf{}\mathbf{2}\sqrt{\mathbf{2}}\mathbf{}\mathbf{\xb7}\mathbf{197}\mathbf{}\overline{)\mathbf{pm}}\left(\frac{1x{10}^{-12}\overline{)m}}{1\overline{)\mathrm{pm}}}\right)\left(\frac{1\mathrm{cm}}{1x{10}^{-2}\overline{)m}}\right)$

**a = 5.57x 10 ^{-8} cm**

(2) Calculate the volume in cm^{3}

$\overline{){\mathbf{Volume}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}{{\mathbf{a}}}^{{\mathbf{3}}}}\phantom{\rule{0ex}{0ex}}\mathbf{Volume}\mathbf{}\mathbf{=}\mathbf{}{\left(\mathbf{5}\mathbf{.}\mathbf{57}\mathbf{}\mathbf{x}\mathbf{}{\mathbf{10}}^{\mathbf{-}\mathbf{8}}\mathbf{}\mathbf{cm}\right)}^{\mathbf{3}}$

**Volume = 1.73x10 ^{-22} cm^{3}**

Calcium crystallizes in a cubic closest packed structure. If the atomic radius of calcium is 197 pm, find the density of the solid.

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