Artificial radioactivity was first discovered by

In the nuclear reaction $_{92}U^{238} \to _{82}Pb^{206} + x\,_{2}He^{4} + y\,_{-1}\beta^{0}$,the values of $x$ and $y$ are respectively......

On bombarding $_8^{16}O$ with deuterons,the nuclei of the product formed will be

An artificial radioactive isotope gave $_7^{14}N$ after two successive $\beta$-particle emissions. The number of neutrons in the parent nucleus must be

In the nuclear reaction $_3Li^6 + (?) \to _2He^4 + _1H^3$,the missing particle is:

The nuclear reaction $_3Li^6 + _1H^2 \to 2_2He^4 + \Delta E$ represents: