Which equation shows a correct alpha decay?
88226Ra→84224Rn+42He{}^{226}_{88}\text{Ra} \rightarrow {}^{224}_{84}\text{Rn} + {}^{2}_{4}\text{He}88226Ra→84224Rn+42He
88226Ra→86222Rn+20He{}^{226}_{88}\text{Ra} \rightarrow {}^{222}_{86}\text{Rn} + {}^{0}_{2}\text{He}88226Ra→86222Rn+20He
88226Ra→86222Rn+24He{}^{226}_{88}\text{Ra} \rightarrow {}^{222}_{86}\text{Rn} + {}^{4}_{2}\text{He}88226Ra→86222Rn+24He
88226Ra→86222Rn+10He{}^{226}_{88}\text{Ra} \rightarrow {}^{222}_{86}\text{Rn} + {}^{0}_{1}\text{He}88226Ra→86222Rn+10He