The diagrams illustrate the structures of two different forms of the same element. What makes T suitable for use in cutting tools and U suitable for use as a lubricant?
- AT: It is very hard because each atom is held in place by strong covalent bonds. U: The layers can slide over each other because the covalent bonds are weak.
- BT: It is very hard because each atom is held in place by strong covalent bonds. U: The layers can slide over each other due to weak forces between the layers.
- CT: It is very hard because there are no electrons able to move. U: The layers can slide over each other because the covalent bonds are weak.
- DT: It is very hard because there are no electrons able to move. U: The layers can slide over each other due to weak forces between the layers.