____→23392u+0−1e complete this equation

let me rewrite this equation

_____→²³³₉₂U + ⁰₋₁e

 the above decay is a beta emission,  the preceding ( reactant)  element have atomic number of 91 and a mass number of 233, beta decay does not change atomic mass.

 the balanced equation will therefore be,

²³³ ₉₁Pa→²³³₉₂U + ⁰₋₁e

 the answer  is protactinium-233.

one thing we have to take note is to identify if we  are finding the a reactant or a product.