I'm not quite sure, but the further right you go on the periodic table the less metalic it gets.
Elements that exhibit properties of both metals and nonmetals are called metalloids. Metalloids typically have a combination of metallic luster and electrical conductivity, along with nonmetallic characteristics such as brittleness. Common examples of metalloids include silicon, germanium, and arsenic. These elements are often used in electronics and other applications where both metallic and nonmetallic properties are advantageous.
Metallic, sub metallic, and nonmetallic are properties of the mineral luster.
Iron, copper, and gold are examples of nonmetallic elements and not metalloids. These elements do not possess the properties of a metalloid, such as having both metallic and nonmetallic characteristics.
Assuming that "least nonmetallic" means the same as "most metallic", francium.
Limestone is a nonmetallic mineral. It is a sedimentary rock primarily composed of calcium carbonate, which is a chemical compound with a nonmetallic element (calcium) and a nonmetallic element (carbon) bonded together. Metallic minerals, on the other hand, are composed of metals or have metallic properties. Limestone does not fall into this category.
Differences exist in chemical and physical properties.
Silicon is a metalloid, which means it has properties of both metals and nonmetals. It has some characteristics of metals, such as conductivity, but also some nonmetallic properties, like brittleness.
Nitrogen, the first element in Group 15, has the most nonmetallic properties. It is a diatomic gas at room temperature, demonstrating typical nonmetal characteristics such as covalent bonding and low reactivity.
Rubidium (Rb) is an alkali metal.
Nonmetallic materials are typically made of elements that do not exhibit metallic characteristics, such as carbon, nitrogen, oxygen, and silicon. These materials often have properties such as high strength, low density, and good insulating properties. Examples of nonmetallic materials include ceramics, polymers, and composites.
Metalloids are the border lines between the metals and the nonmetals in the Periodic Table.
Silicon is a metalloid, having both metallic and nonmetallic properties.