The composition of an $\alpha$-particle can be expressed as:

Write the formula for the average radius of a nucleus.

The most stable particle in the Baryon group is

For a nucleus to be stable,the correct relation between neutron number $N$ and proton number $Z$ is

The three stable isotopes of neon: $_{10}^{20}Ne$,$_{10}^{21}Ne$,and $_{10}^{22}Ne$ have respective abundances of $90.51\%$,$0.27\%$,and $9.22\%$. The atomic masses of the three isotopes are $19.99\;u$,$20.99\;u$,and $21.99\;u$ respectively. Obtain the average atomic mass of neon. (in $;u$)

$A$ reaction between a proton and $_8^{18}O$ that produces $_9^{18}F$ must also liberate: