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Classes of Elements ( Pages 244 – 245)
Properties Properties = observations you can make about something. Example = what are the properties of a football?
Most metals share these properties… 1.Shiny 2.Ductile 3.Good Conductors of Electricity 4.Malleable 5.Good Conductors of Thermal Energy 6.Solid at room temperature
SHINY You can see your reflection in a mirror because mirrors have a thin layer of silver (Ag) behind the glass.
DUCTILE Most metals are ductile, which means they can be made into thin wires.
Good CONDUCTORS of electricity Wires in electrical devices in your home are made of copper.
MALLEABLE Most metals are malleable, which means they can be flattened into thin sheets or formed into shapes without shattering. Aluminum (Al) can be flattened into sheets to make foil and cans.
Good CONDUCTORS of thermal energy Most metals are good at transferring heat. Iron (Fe) griddles conduct thermal energy from a stove top to cook food.
Most metals are solids at room temperature Lithium (Li) Zinc (Zn) Nickel (Ni) Sodium (Na) Gold (Au Calcium (Ca)
Most nonmetals have these properties… 1.Not shiny 2.Not ductile 3.Not good conductors of electricity 4.Not malleable 5.Not good conductors of thermal energy 6.Gases at room temperature
Most nonmetals are gases at room temperature Neon (Ne) Helium (He) Argon (Ar) Hydrogen (H) Nitrogen (N)
Metalloids are known as semi- conductors. This means that they can conduct electricity depending on their temperature. Metalloids share some properties of metals and some properties of non- metals.
Boron (B) Silicon (Si) Arsenic (As)
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