1. if you have 20 grams of parent material and two half-lives go by, how much parent material do you have remaining? how much daughter material do you now have?

Man i dont know this answer

Ithink the answer is b.

Answer( precipitate );

Well you can immediately rule out a and d because if a metal were to lose or gain protons, then it would become a different element all together. the answer here is b because the positive symbol with a number refers to how many electrons the metal can give away to become stable.