Final answer:
Some metals may not appear metallic due to factors such as surface oxidation or impurities, but they still possess the characteristic properties of metals.
Step-by-step explanation:
Metals are classified based on their physical and chemical properties. While many metals look shiny and metallic, there are some metals that do not have this appearance. The term 'metal' refers to elements that have certain characteristics such as being malleable, ductile, and good conductors of heat and electricity. However, some metals may not exhibit a metallic appearance due to factors such as surface oxidation or the presence of impurities. For example, bismuth is a metal that appears dull and has a pinkish color. Despite its appearance, it still possesses the characteristic properties of a metal.