Chapter 4, Section 3 Metals

Properties of Metals Good conductors of electric current and heat Shiny and bendable Most elements in the Periodic Table are Metals

Physical Properties of Metals Luster (how shiny it is) Malleable = it can be hammered or rolled into flat sheets or other shapes Ductile = can be pulled out into a long wire Table Talk: Copper, pictured here, is both malleable and ductile. Can you think of any other metals that are like Copper?

Physical Properties of Metals (cont’d.) Thermal conductivity = the ability of an object to transfer heat. Electrical conductivity = the ability to transfer electricity. Some metals are magnetic - iron (Fe), cobalt (Co), and nickel (Ni) Most metals are solid at room temperature Do you know which metal is a liquid at room temperature? (Think thermometers…… )

Chemical Properties of Metals Reactivity = the ease and speed in which a substance reacts with another substance Metals usually react by losing electrons to other atoms Some metals like (Na) sodium are more reactive than others (Au) gold The gradual wearing away of a metal in a chemical reaction is called corrosion. Table Talk: When have you observed metal corrosion? How would corrosion affect conductivity?

Metals in the Periodic Table The metals in a group, or family, have similar properties The reactivity of metals tends to decrease as you move from left to right on the Periodic Table METALS Reactivity decreases See BrainPop “Metals”

Synthetic Elements Elements with atomic numbers higher than 92 Scientists make these by forcing nuclear particles to crash into one another. Cooling Towers of a nuclear reactor Particle accelerator end