The answer to this problem is Beryllium is an alkaline earth metal.
Movement of molecules from an area of higher concentration to one of lower concentration is called Diffusion
The symbol for the hydroxide ion is OH-
Answer=1
Potassium Sulfide= K2S (two metals, one non metal)
Sodium Oxide=Na2O (two metals. one nonmetal)
Sodium Chloride=NaCl (one metal, one nonmetal)
Magnesium Oxide=MgO (one metal, one nonmetal)
Magnesium Chloride=MgCl2 (one metal, two nonmetals)