The element used for dating the ancient remains is

In the reaction $_{93}Np^{239} \xrightarrow{} _{94}Pu^{239} + (?)$,the missing particle is

In the following nuclear reaction,identify $x$: $_{29}Cu^{64} \to _{28}Ni^{64} + x$

What kind of radioactive decay does not lead to the formation of a daughter nucleus that is an isobar of the parent nucleus?

An element with atomic number $84$ and mass number $218$ loses one $\alpha$-particle and two $\beta$-particles in three successive stages. The resulting element will have:

What is the symbol for the nucleus remaining after $_{20}Ca^{42}$ undergoes $\beta$-emission?