Mercury-203 undergoes beta minus decay. 203 80 hg → 203 81 tl + ? the subatomic particle produced is a(n) . 203 80 hg → 203 81 tl + 0 -1 e is this the correct balanced equation? .

A negative beta particle

Yes

Explanation:

The incomplete equation of the reaction:

                  ²⁰³₈₀Hg → ²⁰³₈₁Tl + ?

In order to balance nuclear equations, we must conserve the mass number and atomic number.

For the mass number; 203 = 203 + a

                                         a = 0

             Atomic number; 80 = 81 + b

                                           b = -1

The unknown has no mass number but an atomic number of -1

This a  negative beta particle and it is designated as ⁰₋₁e