$_6^{12}C$ absorbs an energetic neutron and emits a beta particle. The resulting nucleus is

After one $\alpha$ and two $\beta$ emissions,what happens to the nucleus?

How many energy rays of $\alpha$-particles are emitted from $_{83}^{214}Bi$?

Which one of the following is a possible nuclear reaction?

$A$ free neutron decays into a proton, an electron and

In $\beta^{-}$ decay, a neutron transforms into a proton within the nucleus according to the equation:
$\text{neutron} \rightarrow \text{proton} + \beta^{-} + x$
In this equation, the particle represented by '$x$' is: