Question: what is the difference between atp and amp?
Answer: As Chandranil Deb said, AMP stands for adenosine monophosphate: While ATP stands for adenosine triphosphate: You can still see the adenine nitrogenous base on the right and the ribose sugar in the middle, that stays the same. The difference is the two additional phosphate groups to the left on adenosine triphosphate.