Which atom is it?

Electricity and Magnetism Level 4

The electric charge density inside an atomic nucleus of radius RR is ρ(r)=ρ0[1−(rR)2].\rho (r) = {\rho}_{0} \left[1-{\left(\frac{r}{R}\right)}^{2}\right]. If ρ0=5×1025 C/m3{\rho}_{0} = 5 \times {10}^{25}\text{ C/m}^{3} and R=3.4×10−15 mR = 3.4 \times {10}^{-15}\text{ m}, what is the total charge?

Express your answer to the nearest elementary charge (should be an integer).

Steven Zheng by Steven Zheng
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