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
₈₄²¹⁴Po
→ ₈₂²¹⁰Pb
+ ₂⁴He
