Which of the following physical properties is NOT characteristic of metals?

Metals are known for a range of characteristic physical properties, including their high electrical conductivity, malleability, shiny appearance, and good thermal conductivity.

Metals typically exhibit excellent electrical conductivity due to the presence of free-moving electrons in their structure, which allows electric current to flow easily. In terms of malleability, metals can be easily deformed under stress without breaking, allowing them to be hammered into thin sheets. Their shiny appearance is a result of their ability to reflect light, which is a common trait among metals. Additionally, metals generally have high thermal conductivity, enabling them to efficiently transfer heat.

The option that suggests poor electrical conductivity contradicts the established physical properties of metals. Thus, stating that poor electrical conductivity is a characteristic of metals is incorrect and does not align with the understanding of metallic properties.