Which is the correct unit for measuring nuclear radii?

The order of magnitude of the density of a uranium nucleus is: (Given: ${m_p} = 1.67 \times 10^{-27} \ kg$)

Why do stable nuclei never have more protons than neutrons?

Consider a nucleus ${ }_{30}^{60} X$. Its approximate density is (Take $1 \text{ amu} = 1.6 \times 10^{-27} \text{ kg}$,$R_0 = 1.2 \times 10^{-15} \text{ m}$)

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

The atomic number of a nucleus is $Z$ and the atomic mass number is $M$. The number of neutrons is