How do the fracture toughness values compare between ceramics, polymers and metals?

Metal has characteristics like, high electrical and thermal conductivity, the ability to be deformed or cut into new shapes without breaking, and high mechanical strength.Ceramics are generally compounds between metallic and nonmetallic elements and include such compounds as oxides, nitrides, and carbides. Typically they are insulating (not electrical or thermally conductive) and resistant to high temperatures and harsh environments (corrosion resistant).Plastics (or polymers) are generally organic compounds based upon carbon and hydrogen. They are very large molecular structures.

The answer is c. 320 g

Neither model is able to show the reactivity of potassium.