The technetium-99 nuclide radioactively decays by beta emission. write a balanced nuclear chemical equation that describes this process.

Tc-99m is a metastable  isomer of Tc-99. It finds widespread applications in medical diagnostic procedures.

Tc-99 is also a radioactive element. It's half-life is 2,11,000 years. Upon radioactive decay, it emits beta particles and gets converted into stable compound Ruthenium-99

This process of radioactive decay is shown below.
99 43Tc    →       99 44Ru     +     0 -1e
                            (stable)           (β particle)

The answer for this is a