Gold-198 is used to treat liver cancer. Its half-life is 2.7 days. If you ingest 3.75 mg of Au-198, how long would you have to wait for the amount of Au-198 to fall to 0.75 mg?

if you're asking what comes out, it's steam.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.