How much of the original amount of an isotope is present after a period of two half-lives? A. Four times the original amount
B. One-fourth of the original amount
C. Twice the original amount
D. Half of the original amount

Vi limitens. vastery test select the correct answer. which statement explains why large atoms are more reactive than small atoms? a. large atoms have valence electrons farther from the nucleus and lose them more readily. b. large atoms have greater ionization energy, which they can utilize during a reaction. c. large atoms have a greater number of electrons that they can lose during a reaction. d. large atoms have more energy levels, so they have more energy to pass on in a reaction. reset next