51 atoms and 51 bonds - teacher sized inorganic and organic chemistry set Hard plastic storage case Standard size, interchangeable with other branded sets EISCO Teacher Inorganic and Organic Chemistry Molecular Model Set, 101 Pieces (51) Atoms, (50) Bonds This teacher/student inorganic and organic molecular model set is the perfect set for introductory chemistry in the classroom. It contains the following parts: [10] Carbon (black), 4 Holes [15] Hydrogen (white), 1 Holes [6] Oxygen (red), 2 Holes [4] Nitrogen (blue), 4 Holes [4] Chlorine (green), 1 Holes [1] Chlorine (green), 4 Holes [1] Sulphur (yellow), 2 Holes [1] Sulphur (yellow), 4 Holes [1] Phosphorus (purple), 4 Holes [2] Bromine (orange), 1 Holes [2] Iodine (purple), 1 Holes [2] Metal (grey), 1 Holes [1] Metal (grey), 2 Holes [1] Metal (grey), 4 Holes [30] Short Bonds [10] Medium Bonds [10] Long (Flex) Bonds