Atoms in a liquid have energy than atoms in a solid, so the easiest way to change a solid to a liquid is to add . When changing from a solid to a liquid, there is a magic temperature for every substance called the .

Answer

Atoms in a liquid have more kinetic energy

so the easiest way to change a solid to a liquid is to add heat

When changing from a solid to a liquid, there is a magic temperature for every substance called the boiling point

radioactive decay occurs in unstable atomic nuclei – that is, ones that don't have enough binding energy to hold

the nucleus together due to an excess of either protons or neutrons.

thats how its supposed to be