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Density = mass/volume
hence we need to find out both mass and volume.
mass of Proton & neutran = 1.67e-27 kg
hence mass , m =207*1.67e-27=3.45e-25 kg
volume of sphere =(4*pi / 3)*R^3
Radius = Ro*A^1/3= 1.2e-15*(207)^1/3= 7.1e-15
therefore volume, V =(4pi/3)*(7.11e-15 )^3
volume =1.49 e-42 m^3
Hence, Density = (3.45e-25)/(1.49e-42) = 2.303e17 kg /m^3
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