Which of the following is NOT a property of metals?

Metals are typically known for their excellent conductivity, both in terms of electricity and heat. They are also characterized by their malleability, which allows them to be shaped into thin sheets without breaking, and their hardness, indicating their ability to resist scratching and deformation.

Brittleness, on the other hand, is a property more associated with non-metals or certain alloys rather than typical metals. While some metals can become brittle under specific conditions, such as being exposed to very low temperatures or certain impurities, the general behavior of metals is to be ductile rather than brittle. Therefore, stating that brittleness is a property of metals does not align with the standard characteristics we associate with them.