The sun is in the middle baby :)
Compressibility refers to the amount or extent to which a substance can be compressed, also involving the the relationship between changes in volume due to applied pressure.
Explanation:
Plutonium
The symbol is Pu and it exists in the solid state.
The complete chemical formular is given as; Pu(s)
Iodine
The symbol is I and it exists exists as a lustrous, purple-black non-metallic solid at standard conditions
The complete chemical formular is given as; I(s)
Helium
The symbol is He and it exists in the gaseous state.
Te complete chemical formular is given as; He(g)