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The nuclear radius of a certain nucleus ...

The nuclear radius of a certain nucleus is `7.2 fm` and it has charge of `1.28xx 10^(-17) (C)`. Find the number of neutrons inside the nucleus.

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The correct Answer is:
A, C
`7.2=1.2 A^(1//3)`
`A=6^3=216`
`1.28 xx 10^(-17)=Z xx 1.6 xx 10^(-19)`
`128/1.6=Z=80`
`N=A-Z=136`
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