Metals, nonmetals & metalloids

1. Metals, nonmetals & metalloids Chapter 9 Lesson 3

2. What are metals? • Make up most of the periodic table. • 75% of elements are metals. • They have shiny surfaces, conduct heat and electricity well and can bend without breaking.

3. What are metals? • Malleability- the ability to be bent, flattened, or hammered without breaking. • Ductility – the ability to be pulled into thin wires without breaking • Corrosion – metals combine with nonmetals from the environment (ex rust)

4. Uses of Metals • Early man used metals for tools and jewelry. • Today we use it in buildings (steel frames, wires, pipes,) the medical field (replace bones, close wounds) and for batteries.

5. Nonmetals • Located on the right side of the periodic table. • Poor conductors of heat and electricity • Good insulators • Dull surfaces, break or crumble when bent • Includes the noble gases (far right column of periodic table) that do NOT interact with other elements.

6. Metalloids • Boron, silicon, germanium, arsenic, antimony, tellurium, & polonium • Have properties of both metals and nonmetals • Look like metals, but not as shiny • Not malleable or ductile. • Semiconductors – materials with properties between conductors and insulators

7. Uses of nonmetals and nonmetals. • Nonmetals are excellent insulators • Can be drawn into strong fibers to strengthen materials • Can be used to make things flameproof. • Semiconductors used to make computer chips