1. Properties of elements

2. Properties of Metals
Physical Properties
Chemical Properties
Shininess or luster
Malleable: material can be hammered into sheets or shapes
Ductile: material can be pulled into wires
Conductivity: object can transfer heat or electricity
Magnetism
Solids at room temperature
Reactivity: ease and speed with which an element combines or reacts with other elements or compounds
Corrosion: destruction of metal during a chemical change

3. Properties of Nonmetals
Physical Properties
Chemical Properties
10 of 16 nonmetals are gases
Dull and brittle
Lower density
Poor conductors of heat and electricity
Good insulators
Most nonmetals are reactive and form compounds

4. Metalloids Appear along the border of the metals and nonmetals
Have characteristics of both metals and nonmetals
All are solids at room temperature, brittle, hard, and somewhat reactive
Most common is silicon (sand, glass); Boron is used in making heat-resistant glass and cleaning materials
Most useful property of the metalloids is their varying ability to conduct electricity
Metalloids are used to make semiconductors, which are substances that can conduct electricity under some conditions but not under other conditions; computer chips, transistors, and lasers