What is the ratio of $\frac{q}{m}$ for an $\alpha$-particle to that of a proton?

The nuclear radius of a hydrogen atom is approximately . . . . . . . (in $fm$)

The coordination number of $Cu$ is

In a periodic table,the average atomic mass of magnesium is given as $24.312 \; u$. This average value is based on their relative natural abundance on Earth. The three isotopes and their masses are $_{12}^{24} Mg \; (23.98504 \; u)$,$_{12}^{25} Mg \; (24.98584 \; u)$,and $_{12}^{26} Mg \; (25.98259 \; u)$. The natural abundance of $_{12}^{24} Mg$ is $78.99 \%$. Calculate the abundances of the other two isotopes.

Which stable nucleus has a radius that is half that of $Fe^{56}$?

Is nuclear force short range or long range?