Which of the following is the most ductile?

Explanation

Ductility is the property of being drawn into wires, it is a permanent strain tension test.Copper can be drawn into very thin wires as it is a metal; its atoms have the ability to roll over each other into new positions without breaking the metallic bond.While cast iron is brittle and will break due to its weak tensile strength means that it will fracture before it bends or distorts.In case of high carbon steel, the carbon atoms are much smaller than iron atoms and as more carbon is put into a lattice or iron atoms, it becomes harder for the iron atoms to slide easily past each other because of the carbon, and the steel becomes much more brittle and less ductile.For glass, the molecular structure is made up of tetrahedral crystals which do not have large-area orderly crystalline structure therefore they rupture under stress.Hence copper is the most ductile.