Which one of the following statements is corr | vedclass

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(D) $1$. The radius of a nucleus is given by $R = R_0 A^{1/3}$,where $A$ is the mass number. Option $A$ is incorrect because it states $A^{1/2}$.$2$.

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$_{20}Ca^{40}$ has a magic number of protons and a magic number of neutrons

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(D) $1$. The radius of a nucleus is given by $R = R_0 A^{1/3}$,where $A$ is the mass number. Option $A$ is incorrect because it states $A^{1/2}$.$2$. Isobars are atoms with the same mass number but different atomic numbers. $_{7}N^{15}$ and $_{8}O^{16}$ have different mass numbers ($15$ and $16$),so they are not isobars. Option $B$ is incorrect.$3$. The thorium series ($4n$ series) ends at the stable isotope $_{82}Pb^{208}$. Option $C$ is incorrect as it mentions $_{83}Bi^{209}$.$4$. Magic numbers for nucleons are $2, 8, 20, 28, 50, 82, 126$. For $_{20}Ca^{40}$,the number of protons is $20$ and the number of neutrons is $40 - 20 = 20$. Since both $20$ and $20$ are magic numbers,option $D$ is correct.

Which one of the following statements is correct?

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