When Iodine-131 emits a β particle will produce Xe-131
Further explanation
Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles,
- alpha α particles ₂He⁴
- beta β ₋₁e⁰ particles
- gamma particles ₀γ⁰
- positron particles ₁e⁰
- neutron ₀n¹
So for reaction Iodine-131 :
![\tt _(53)^(131)I\rightarrow _(-1)^0\beta +_(54)^(131)Xe](https://img.qammunity.org/2021/formulas/chemistry/high-school/rf36ykhw92fa3w8uu8ocsqgm0m565l5lqj.png)