# Radioactive Decay - Alpha Decay

### Alpha Decay

$X Z A → Y Z−2 A−4 + H 2 4 e$
1. During an alpha decay, a radioactive atom X decay and emits an alpha particle ($H 2 4 e$ ).
2. Atom X losses 2 neutron and 2 proton and become atom Y.

Example
$U 92 238 → T 90 234 h+ H 2 4 e P 84 210 o→ P 82 206 b+ H 2 4 e R 88 226 a→ R 86 222 n+ H 2 4 e R 86 222 n→ P 84 218 o+ H 2 4 e$