Asample of thorium-234 has a half life of 25 days. will the thorium undergo rafioacrive decay and be completely gone in 100 days? explain your reasoning and show your work.

I don't know terribly much about radioactive decay, but yes, it WILL decay. If it's half life is 25 days, it will be completely consumed in 50 days. By 100 days, it should be long gone. As far as I know, the reason for this is (besides the simple math which is self-explanatory) the Thorium has so many protons/neutrons, it's unstable and thus undergoes radioactive decay as it cannot maintain stable form.

I hope this helps! :) 

It must be measured in k.hope my answer is to you : )