What is atomic radius? does it decrease going up or down a group?

What does a particular point on a line of a phase diagram represent? o a. the maximum temperature a substance can exist at without bonds breaking b. the pressure created by the kinetic energy of molecules at a particular temperature c. the melting point or boiling point of a substance at a specific pressure d. the conditions in which temperature and pressure have equal effects on a substance

What three things determine the shape and size of a puddle when water is poured out onto a surface

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?