Gold has a closely packed structure which can be viewed as spheres occupying \( 0.74 \) of the t...

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Gold has a closely packed structure which can be viewed as spheres occupying \( 0.74 \) of the total volume. If the density of gold is \( 19.7 \mathrm{~g} / \mathrm{ml} \), then the atomic radius of gold (in pm) is \( [\mathrm{Au}=197 \), \( \left.(1.43)^{3} \times 4 \pi=37, N_{\mathrm{A}}=6 \times 10^{23}\right] \)
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