What letter represents the critical temperature?

Can someone me with these questions plz.

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.

Need ! asap will mark 10 pts using the room temperature line (orange line) and your periodic table, make lists that identify the state of matter (gas, liquid, or solid) in which each element you plotted exists at room temperature. explain your answers