The atomic number of a radioactive element increases by one unit in:

During a $\beta$-decay,the mass of the atomic nucleus

In the radioactive decay of $X$ into $Y$ as shown below,what is the value of $_Z{Y^m}$?
$_{6}{X^{14}} \xrightarrow{-3\beta} {_{Z}}{Y^{m}}$

After losing a number of $\alpha$ and $\beta$ particles,$_{92}U^{238}$ changed to $_{82}Pb^{206}$. The total number of particles lost in this process is

$A$ radioactive atom $^X_Y M$ emits two $\alpha$ particles and one $\beta$ particle successively. The number of neutrons in the nucleus of the product will be

$\beta$-emission is always accompanied by