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Unit 1: Elements and compounds

Unit 1: Elements and compounds. Lesson 1: What are metals?. METAL. A substance that transfers heat and electricity well and is malleable. NONMETAL. A substance that does not transfer heat and electricity well and is not malleable. MALLEABLE. Easy to shape or to form. ALLOY.

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Unit 1: Elements and compounds

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  1. Unit 1: Elements and compounds Lesson 1: What are metals?

  2. METAL • A substance that transfers heat and electricity well and is malleable

  3. NONMETAL • A substance that does not transfer heat and electricity well and is not malleable

  4. MALLEABLE • Easy to shape or to form

  5. ALLOY • A solid solution in which a metal or a nonmetal dissolves in a metal

  6. METALLOID • A substance that has some of the properties of a metal and some of the properties of a nonmetal

  7. METALS AND NONMETALS • Metals are a good conductor of heat and electricity because they heat up quickly, and electricity passes through them quickly. • 75% of all elements are metals. • Metals, with the exception of hydrogen, are located on the left side of the periodic table. • Nonmetals are located on the far right side. • If a substance looks like a metal it is called metallic. They often reflect light and are often shiny. Most metals are grey or silver in color. • In addition, metals are malleable, which means they are easily shaped or formed.

  8. PROPERTIES OF METALS • Elements that are in the same column of the periodic table are called a family. • This means that they are related, just like members of a real family. • Also most elements in the same family have the same physical properties.

  9. OTHER PROPERTIES OF METALS • Metals that are good conductors of heat have a high thermal conductivity. • Metals that are good conductors of electricity have a high electrical conductivity. • Materials that do not conduct heat or electricity well are called insulators.

  10. SEEING METAL ATOMS • Atoms are small. 20 million large atoms placed side by side would only measure one centimeter. • These small atoms are visible with an electron microscope. • Another type of microscope called scanning tunneling microscope (STM), uses a probe to examine the surface of a material. • Today, scientists can use STMs to check for flaws in materials and observe molecules.

  11. ALLOYS AND METALLOIDS • An alloy is formed by combining metals or by combining a metal and a nonmetal. • Metalloids, or semimetals, are elements that contain properties of metal and some nonmetals.

  12. ONLINE RESOURCES Properties of Metals (0:49) http://www.youtube.com/watch?v=cWKzKX565eU Periodic Table Song (3:36) http://www.youtube.com/watch?v=5kbe57m-tpY

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