In chemistry, the half-life of a reaction is defined as the time needed for the concentration of a reactant to decrease to half of its initial concentration.
According to that definition, the half-life of the reaction will be
t1/2 = 0,693/k
where k is the equilibrium constant for that reaction at a specific temperature.
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Yes.
Which drug calculations? The toxic dose, the effective dose, the required dose, the metabolic halflife, the time since consuming and many more calculations require completely different formulae and data.
Yes, but it has a halflife of only 0.86 seconds.
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There is no simple formula to determine the half life of every single radioactive isotope. However, y = A(.5)^t/h, where A=staring amount, t=time, and h= half life, is a general equation that usually works well.
The half life of plutonium-235 is 25,3(5) minutes.
3-5 days, 18-50 hour halflife
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many. one example is lead-214 with a halflife of 26.8 minutes.
For the half lives of all curium isotopes see the link below.