specifically a "ball-and-stick" atomic construction set). [1, 2]
In chemistry, these color-coded spheres aren't just random beads; they represent specific chemical elements (historically following the CPK color system):
Black: Carbon atoms
Red: Oxygen atoms
White: Hydrogen atoms
Green: Halogen atoms (like Chlorine)
 
Current Market Value
As a molecular kit, its value jumps higher than it would as a standard toy. A clean, well-sorted vintage set like yours in its original wood slide box is generally worth between £50 and £95 GBP