Question

Why can metallic elements bend, while solid but non-metallic break or crumble?

Answer 1

Metallic elements are flexible because of its experience for the atoms to roll on top of one added without crushing its metallic bond (This is because it is fascinated with united force, and is the cause why they have higher melting/boiling points); however, a nonmetals form atomic bonds which don't have this property.

Answer 2

Metallic elements can bend because they have the property of being ductile. This means that a solid material stretches under tensile stress. If a material is ductile then it may be stretched into a wire. Further, the material can also be malleable.