Two atoms that are isotopes of one another must have different number of what? a: protons b: neutrons c: electrons d: all particles

For many of the chemical elements there are several known isotopes. Isotopes are atoms with different atomic masses which have the same atomic number. The atoms of different isotopes are atoms of the same chemical element; they differ in the number of neutrons in the nucleus.

the hail might freeze and damage cars

it might make people fall because it can turn into ice