Metals, Non-Metals, and Metalloids
Niobium has lots of physical properties. It is malleable because it can be hammered into thin sheets. It has a good luster (shininess). Niobium is also a good conductor of heat and electricity.
Sulfur has no luster, it is very dull. It is brittle so it breaks easily. Sulfur is a poor conductor of heat and electricity. These are three physical properties of sulfur.
Metalloids can be shiny or dull. They are solids and are malleable. They conduct heat and electricity better than non-metals, but not as well as metals.