Brainliest will be given! ! you have 40 g of a radioisotope. if the half-life of this radioisotope is 4 days, how many grams will remain after 12 days? show work!

What is the mass of sodium in 3 moles of sodium chloride

What happens to the atomic radius when an elctron is lost

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.