Elements with atomic masses in brackets or parentheses are radioactive and unstable. The atomic mass represents the most stable isotope. List the names and symbols of three of these elements.

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d