Materials with low density like aluminum and carbon fiber are used in applications requiring lightweight properties such as in aircraft frames or sports equipment. Their low density arises from their atomic arrangement and bonding
Transparency
Glass and clear plastics used in windows and screens have a uniform atomic or amorphous structure that allows light to pass through without scattering
Hardness
Diamond with its tighty bonded carbon atoms in a tetrahedral structure is used in cutting tools because of its extreme hardness
