Which is a key component of the energy molecule atp?

The correct answer is phosphorous but occurs in the form of a phosphate. ATP stands for Adenosine Triphosphate. 

ATP is composed of three components.  At the center of the molecule is found ribose, a sugar molecule which is the very same sugar that forms part of RNA. To one side of ribose is attached a base known as adenine. This base belongs to a group of molecules made of linked rings of both carbon and nitrogen atoms.

To the other side of ribose is attached a string of phosphate groups which are key to the energy carrying activities of ATP.

This answer is not mine, this answer is TaskMasters! Thank you :D

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.