How do you find the atomic mass of an isotope? a. double the number of neutrons. b. add the atomic number to the number of neutrons. c. subtract the atomic number from the atomic mass. d. double the atomic number and add the number of valence electrons.

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?