There are three known forms of uranium. these forms are called of each other.

a. isotopes
b. copies
c. triplicates
d. molecules

A. Isotopes

Explanation:

The answer is isotopes. Isotopes are different kind of atoms of the same element.

do you have a formula possibly

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.