The mass number of a nucleus is equal to the number of

Define mass. Write the unit of mass used in nuclear physics and its value in kilograms.

The density (in $kg m^{-3}$) of nuclear matter is of the order of

Consider the following two statements,$A$ and $B$ and identify the correct answer given below:
$A$. Nuclear density is same for all nuclei.
$B$. Radius of the nucleus $R$ and its mass number $A$ are related as $\sqrt{A} \propto R^{1 / 6}$.

Is nuclear force short range or long range?

The particles which can be added to the nucleus of an atom without changing its chemical properties are called: