when it goes from cloud to rain/back to earth in the form of rain
part 1: the half-life of the element is 22 years.
part 2: it will take 132.02 year for the sample to decay from 308.0 g to 4.8125 g.
part 1: there are two ways to determine the half life time.
first way: the half life time can be determined directly from its definition as it is the time required for the sample to decay to its half concentration.
from the data the initial concentration was 45.0 g and decayed to its half value (22.5 g) in 22.0 years.
second way: the radio active decay is considered first order reaction so we can use the laws of first order reactions.
k = (1/t) ln (a/a-x), where k is the rate constant of the reaction,
t is the time of the reaction
a is the initial concentration of the reactant
a-x is the remaining concentration at time (t)
a = 45.0 g the initial concentration at t = 0 year.
at t = 22 year, a-x = 22.5 g
then k = (1/22 year) ln (45.0 g/ 22.5 g) = 0.0315 year-1.
the half-life time (t1/2) = ln 2/ k = 0.693/ k =0.693/ 0.0315 = 22 years.
using the same law k = (1/t) ln (a/a-x),
using the given data; a = 308.0 g and a-x = 4.8125 g and the calculated k from the part 1 (k = 0.0315 year-1)
t = (1/k) ln (a/a-x) = (1/0.0315) ln (308.0/ 4.8125) = 132.02 years
some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg
it is stable as it is in group 0 which have full outer shells of electrons