(A) What Percent of the Original Polonium-215 Is Left After

Short Answer

$$\text { Polonium-215, } \begin{array} { c } 215 \\84\end{array} \mathrm { Po } , \text { undergoes alpha decay with a half-life of } 1.8 \mathrm {~ms} .$$ (a) What percent of the original polonium-215 is left after 0.010 s?
(b) How many protons and neutrons does the daughter nucleus contain?