Here's why:

* Actinide Series: All three elements belong to the actinide series, a group of radioactive elements in the periodic table.

* Electronic Configuration: Their electron configurations share similarities, leading to similar chemical behaviors.

* Radioactivity: They are all radioactive elements.

* Metallic Properties: They exhibit metallic properties like uranium.

However, it's important to note:

* While they share similarities, there are also differences in their properties due to their differing atomic numbers and nuclear structures.

* Plutonium, in particular, has a more complex chemistry than uranium.

Let me know if you want to explore specific properties or differences between these elements!