Metal, Nonmetal, or Metalloid12.docx - Metal Nonmetal or Metalloid Lab Background Elements have unique physical and chemical properties which make them

Metal, Nonmetal, or Metalloid12.docx - Metal Nonmetal or...

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Metal, Nonmetal, or Metalloid? Lab Background Elements have unique physical and chemical properties, which make them useful for specific purposes in our everyday world. All known elements can be classified as metals, nonmetals, or metalloids according to the substance’s specific physical and chemical properties. Physical properties are properties that can be observed without changing the identity of a substance, and chemical properties are properties that are observed while altering the identity of the substance involved. Metals and nonmetals are separated by the zigzag or stair-step line on the periodic table. Most elements are classified as metals, which are located from the center to the left side of the zigzag . Metals are elements that are usually silver-gray in color, with the exception of copper and gold. All metals are solid at room temperature except mercury, which is a liquid. Metals have a lustrous or shiny appearance and reflect light when polished. They can be bent or hammered flat (malleable), can be drawn into wire (ductile), are good conductors of heat and electricity, usually show reaction with acids, and generally have high melting points (many above 800 degrees C). Nonmetals are found to the right of the zigzag line on the periodic table. There are many fewer nonmetals than metals. Nonmetals are usually dull in appearance and do not reflect light. Many are brittle, and therefore cannot be hammered into sheets. Nonmetals are poor conductors of electricity and heat, show little or no reaction with acids, and generally have low melting points. At room temperature, nonmetals can exist as either solids or gases, with the exception of bromine, which is a liquid. Elements found along both sides of the zigzag line are called metalloids, with the exception of aluminum. Metalloids are elements that show properties of both metals and nonmetals.
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