Jun 23, 2016

Hope this is the answer you were looking for.

#### Explanation:

Gold-198 (Au-198) is a ${\beta}^{-}$ emitter: an electron is emitted from the nucleus; the equation is as follows:

So Gold-198 (Au) decays to Mercury-198 (Hg) emitting a ${\beta}^{-}$ particle (""_(-1)^0e) and an antineutrino ($\overline{\nu}$).

Radon-222 is an alpha emitter: two protons and two neutrons are emitted from the nucleus; the equation is as follows:

So Radon-222 (Rn) decays to Polonium-218 (Po) emitting an $\alpha$-particle, sometimes also given as ""_4^2He.