Silicon has three naturally occurring isotopes: si-28 with mass 27.9769 amu and a natural abundance of 92.21 %, si-29 with mass 28.9765 amu and a natural abundance of 4.69 %, and si-30 with mass 29.9737 amu and a natural abundance of 3.10 %

16. in a reaction that has reached equilibrium, a. the forward and reverse reactions are occurring at the same rate. b. the reactants and products are in equal concentrations. c. the forward reaction has gone further than the reverse reaction. d. there are equal numbers of atoms on both sides of the equation. e. a, b, and d are correct.