Given:
The parent nucleus is,
[tex]Th^{234}[/tex]To find:
The product when Th-234 emits a beta particle
Explanation:
When a particle emits a beta particle, the atomic number increases by 1, but the mass number remains the same.
So,
[tex]Th_{90}^{234}-\beta=Pa_{91}^{234}[/tex]Hence, the product is Pa-234 with atomic number 91.