<span>In a sample of pure carbon, some of the atoms have more neutrons than others. This shows that carbon exists in several different isotopes. The correct option among all the options that are given in the question is the third option or the last option. I hope that this is the answer that has actually come to your help.</span>
Isn't a chemical change like something that's not a physical change or physically changed but is something that uses natural chemicals? that's my guess sorry if it's wrong I think I'm wrong though