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Aboval Organic Chemistry Molecular Model Kit Aboval Organic Chemistry Molecular Model Kit allows you to visualize the bonds between atoms in three dimensions. The elements are represented by colored balls and the bonds by flexible rods. Each atom has the same number of holes as the number of valence electrons it needs to complete its outer shell. With this set you can demonstrate single bonds using the short white rods, and double or triple bonds using the long gray rods. Contents 179 Pieces (76 Atoms & 102 Links & 1 Short link remover tool): Atoms: Hydrogen - (1 Holes) White (30) Carbon - (4 Holes)Black (14) Carbon - (5 Holes)Black (6) Oxygen - (4 Holes)Red (6) Nitrogen - (4Holes) Blue (4) Nitrogen - (5 Holes) Blue (2) Cl-Chlorine - (1 Holes)Green(8) Br-Bromine - (1 Holes)Orange(2) I-Iodine - (1 Holes)Purple(2) Metal - (6 Holes)Grey (2) Links: Medium Links(single, rigid) Gray White (40) Long Links (double/triple, flexible)Gray(12) Short Links(for space-filling models)White (50) Short link remover tool(1)