Valence electrons
b. have the highest energy level number
c. are gained or lost to form ions
d. all of the above
e. none of the above

Freezing and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.