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Q. What is size of gold nuclei?

Delhi UMET/DPMTDelhi UMET/DPMT 2008Atoms

Solution:

Nuclear radius of gold $(_{79}Au^{198}) $
$ R_{Au}=R_0(A^{1/3}) $
$ =(198)^{1/3}R_0$
$=5.8 \times R_0$
(where $R_0=1.2 \times 10^{-15}m=1.2 fm) $