Suppose you found a material in which 6.25% of the original radioactive atoms are present. If the half-life is 47 years, how old is the material? *

When the ionic compound nabr dissolves in water, br– ions are pulled into solution by the attraction between what two particles? a. the na+ and br– ions b. the na+ ion and the negative end of a water molecule c. the br– ion and the positive end of a water molecule d. the br– ion and the negative end of a water molecule