Appeared in: 2026 (2 sets)
(a) Consider the following nuclides :
$_6^{12}\text{C}$, $_{80}^{198}\text{Hg}$, $_6^{14}\text{C}$, $_{79}^{197}\text{Au}$
Group them into isotopes and isotones.
(b) How does the size of a nucleus depend on its mass number $\text{A}$ ? Hence prove that the density of nucleus is a constant, independent of $\text{A}$, for all nuclei.