Radium is a member of the alkaline earth family. in addition to being a part of this family, what is another property of radium that you can deduce from the information given in the periodic table? a) the atomic number tells us that radium is a synthetic element. b) based on its location overall, radium is considered a nonmetal. c) the atomic mass and atomic number tell us that radium is a radioactive element. d) the period number tells us that radium is the least reactive member of the family.