In the nuclear reaction: $X(n, \alpha) {_3Li^7}$,the term $X$ will be

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.

Write the value of the $R_0$ constant used in the formula for the radius of a nucleus.

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

$A$ deuteron is bombarded on an $_8O^{16}$ nucleus and an $\alpha$-particle is emitted. The product nucleus is

The mass density of a nucleus varies with mass number $A$ as