A 18.59 gram sample of cobalt is heated in the presence of excess sulfur. A metal sulfide is formed with a mass of 28.71 . Determine the empirical formula of the metal sulfide. Empirical formula=

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.