What is in atp that ADP also has?

ATP is an example of a nucleotide...and some may say a phosphorylated nucleoside.

Let's take a nucleoside. All nucleosides (ATGCU) have two main components. The first is the nitrogenous base (adenine, Guanine, Thymine, Cystosine, Uracil). These are 1 and 2 ring systems (known as Pyrimidines and Purines). The other component they all have is a Ribose sugar. DNA nucleosides have a 2`deoxyribose sugar, and RNA has they regular ribose sugar.

To make a nucleoside a nucleotide, you add phosphate(s) to the sugar. ATP is an example of a triphosphate nucleotide.

It has PO4-PO4-PO4-Sugar-Base

ADP is missing 1 phosphate group: PO4-PO4-Sugar-Base

So, ADP and ATP both have adenine base, ribose sugar, and 2 phosophates. ATP has 1 extra phosphate.

Both ATP (adenosine triphosphate) and ADP (adenosine diphosphate) contain adenine, ribose, and phosphate groups. The main difference between them is the number of phosphate groups: ATP has three phosphate groups, while ADP has two. When a phosphate group is removed from ATP, it becomes ADP, releasing energy that can be used by the cell for various processes.