In the atomic scale,the weakest force in nature is

In the equation ${ }_{13}^{27} Al + { }_2^4 He \longrightarrow { }_{15}^{30} P + X$,the correct symbol for $X$ is:

If the radius of a nucleus with atomic number $Z = 50$ is $9 \times 10^{-15} \ m$,what is the electric potential at its surface?

How is the radius of the nucleus estimated? Write its relation to the radius and atomic mass number.

In the following nuclear reaction $_{12}Mg^{24} + _{2}He^{4} \to _{14}Si^{X} + _{0}n^{1}$,the value of $X$ is:

Two deuterons are moving towards each other with the same speed. If the distance of closest approach is $2 \, fm$,what should be their initial kinetic energy in $MeV$?