1. Elements

2. Vocabulary To Know  Element- a pure substance that cannot be separated into simpler substances by physical or chemical means  Pure substance- a sample of matter, either a single elements or a single compound, that has definite chemical and physical properties  Metal- an element that is shiny and conducts heat and electricity well  Nonmetal- an element that conducts heat and electricity poorly  Metalloid- an element that has properties of both metals and nonmetals

3. Properties of Elements  Each element has a unique set of properties  They DO NOT depend on the amount of the element present.  Properties include: boiling point, melting point, density, and reactivity with acid

4. Categories of Elements  Metals: Shiny and good conductors of heat. Examples- Lead, Tin, and Copper. They are malleable and can be hammered into thin sheets. They are also ductile and can be drawn into thin wire.  Nonmetals: Dull and poor conductors of heat. Examples- Sulfur, Iodine, Neon. Solids tend to be brittle and unmalleable.  Metalloids: Shiny or dull, and semiconductors because they have properties of metals and nonmetals. Examples- Boron, Silicon, and Antimony. Some are malleable and some are ductile.