Question

The molecule arrangement of ice, water, and steam are very different.

Answer 1

Ice is a solid, so the molecules are tightly packed and have very little space between each other. They cannot move about and so their shape remains and volume remain constant.
Water is a liquid. The molecules in a liquid are loosely bound than in solids. The molecules have enough space between them to move about. So, liquids flow and they take the shape of the container they are poured in. Their volume remains constant though their shape does not.
Steam is a gas. The molecules in a gas are very loosely bound to each other. They neither have definite shape nor definite volume. They can very easily move about.
That is why the molecular arrangements of ice, water and steam are very different.

Answer 2

how is the arrangement of molecules in ice different from the arrangement in water