Question

Please use the characteristics of chemical bonding, crystal structures and dislocations to explain why metallic materials are strong and ductile and why ionic and covalent materials are strong but brittle?

Answer 1

chemical bonding betwee metals is actually a metallic interaction between:

- metallic positive ions of metals (cations) will attract electrons

- electros are flowing in the "metallic network"

- their interactions create charge

The free valence helps us unterstan why they conduct electricity, and how their dislloacations help the metal to be malleable and ductile, and are not volatile

Why ionic and covalent materials are strong but brittle -

Hardness Molecular solids are usually much softer than ionic materials.

Ionic crystals are harder but often quite brittle.

Inc omparisson with respect to ionic mateiral, their crystal can force ions of like charge in the lattice to slide into alignment. This typically results in electrostatic repulsion splits the crystal