What happens to ATP when one phosphate group is removed? What new molecule is created when this happens? Which molecule has more energy?

When one phosphate group is removed from ATP ADP is created.
ADP is adenosine di -phosphate and is an adenosine molecule attached to two phosphate molecules.
(ATP is adenosine tri -phosphate and is an adenosine molecule attached to three phosphate molecules.)
ATP would have more energy as energy is created when a bond is broken. Thus energy is released when the phosphate is broken off from ATP to form ADP.