This molymod® set contains a total of 66 atoms and includes the following non metal elements from the periodic table: 14 hydrogen, 12 oxygen, 6 nitrogen, 6 carbon, 2 sulphur, the group 7 halogen elements of: 2 fluorine, 4 chlorine, 2 bromine, 2 iodine and the following metals: 4 grey metal 1 hole (K, Na), 4 grey metal 2 hole (Mg, Ca, Zn, Fe), 4 copper 2 hole (Cu) and 4 grey metal 3 hole (Fe, Al). 20 grey single connectors, 40 grey multiple connection links, and 10 purple.