How many molecules are in Ba3(PO4)2

Using the periodic table, complete the table to describe each atom. type in your answers

Jose and eric were given four samples in lab. the results of their analysis are shown in the table. based on the data they collected, which sample is most likely a metal?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?