Element X has three naturally occurring isotopes. The mass (amu) and % abundance of the isotopes are 37.919 amu (5.07%), 39.017 amu (15.35%), and 42.111 amu (79.58%). ... The isotopic masses and abundances are: 159.37 amu (30.60%), 162.79 amu (15. 79%), and 163.92 amu (53.61%).

Which of the following is the correct definition of chemical energy? a. energy an object has because of its motion or position b. energy resulting from the flow of charged particles, such as electrons or ions c. energy produced from the splitting of atoms d. energy stored in chemical bonds of molecules