Which type of radioactive particle(s) has/have been emitted in the following equation? 214/84 po -> 210/82 pb + ? alpha particle only beta particle only alpha and beta particles alpha and beta particles and gamma radiation

Answer is "alpha particle only".

alpha decay is an emission of ₂⁴He nucleus. If an element undergoes an alpha decay, the mass number of the daughter nucleus formed is reduced by 4 compared to mass number of parent atom and atomic number is reduced by 2 compared to atomic number of parent atom.

Po has atomic number 84 and mass number as 214. Hence, the formed daughter atom should have 84 - 2 = 82 as the atomic number and 214 - 4 = 210 as the mass number. The decay reaction is

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.