Write the nuclear reaction for the following decay processes.

a) Alpha Decay of U-235
b) Beta Decay of Po-209

a) Alpha Decay of U-235

235/92 U --> 4/2 alpha & 231/90 which would be Thorium
your answer is
U-235 --> Th-231 & alpha


b) Beta Decay of Po-209

209/84 Po --> 0/-1 beta & 209/85 which would be At
your answer is
Po-209 --> At-209 & beta