Learn about the Organic Chemistry with this GREAT model set! This NEW economical model set has the same number and types of atom models as The Prentice Hall Molecular Model Set PLUS six extra atoms: 2 sulfur, 2 phosphorus, and 2 fluorine models. The model building instructions include pictures that show how to assemble the atom models. This set contains 124 durable plastic components that can be used to build thousands of molecules. It is the perfect size to carry in your backpack or purse. The snap-closure prevents spills and the compartments keep the atom models and bonds conveniently separated. When learning to visualize 3-D molecular structures, isomerism and nomenclature, this model set is essential. Contents of Molecular Model Set: 14 black carbon atoms 28 white hydrogen atoms 8 red oxygen atoms 4 blue nitrogen atoms 2 yellow sulfur atoms 2 green phosphorus atoms 2 yellow fluorine atoms 8 green chlorine atoms 2 orange bromine atoms 2 purple iodine atoms 12 gray links for multiple bonds, 38mm 40 gray links for single bonds, 25mm Plastic case (16.5 x 9.5 x 3 cm) Instructions Included.