Radioactive decay

Alpha decay

$$ _Z^AX \rightarrow {_{Z-2}^{A-4}}Y + _2^4He$$

Beata decay

$$ _Z^AX \rightarrow {_{Z+1}^{A}}Y + e^-$$

Gamma decay

$$ _Z^AX^* \rightarrow {_{Z}^{A}}X + \gamma$$