Positron is

Hydrogen can be fused to form helium at

If radium and chlorine combine to form radium chloride,the compound is:

What is the packing fraction of $_{26}^{56}Fe$ (Isotopic mass $= 55.92066$)?

In the successive emission of $\alpha$- and $\beta$-particles,the number of $\alpha$- and $\beta$-particles that should be emitted for the conversion of ${}^{238}_{92}U$ to ${}^{206}_{82}Pb$ are:

If the mass defect of ${ }_{5}^{11}B$ is $0.081 \ u$, its average binding energy (in $MeV$) is