Radioactive Decay - Alpha Decay

Alpha Decay

$$X\stackrel{}{\to }Y+He$$

1. During an alpha decay, a radioactive atom X decay and emits an alpha particle ($He$ ).
2. Atom X losses 2 neutron and 2 proton and become atom Y.

Example
$$\begin{array}{l}U\to Th+He\\ Po\to Pb+He\\ Ra\to Rn+He\\ Rn\to Po+He\end{array}$$