Write the unit of mass in nuclear physics and define it and it is equivalent to how many kilograms? 

Explain isotopes, isobar, isotones and isomers by giving examples. 

Assertion $(A):$ Forces acting between proton-protn $\left(f_{p p}\right)$, proton-neutron $\left(f_{p p}\right)$ and neutron-neutron $\left(f_{n n}\right)$ are such that $f_{p p} < f_{p n}=f_{n n}$

Reason $(R):$ Electrostatic force of repulsion between two protons reduces net nuclear forces between them.

Of the following pairs of species which one will have the same electronic configuration for both members?

In nuclear reactions, we have the conservation of

Isotopes are atoms having