1. Metals
Section 20.1

2. Properties Metals- good conductors of heat & electricity.
All but one are solid at room temperature.
Lustrous- reflect light,
Malleable- can be hammered or rolled into sheets,
Ductile- can be drawn into wires
Metals- have 1-3 valence electrons, so they lose electrons to become stable
Metallic bonding- positively charged metallic ions are surrounded by a cloud of electrons.
Outer electrons are not held tightly and can move among the ions- allows conduction of electricity

3. Metals Alkali metals- softer than other metals
Most reactive metals- react violently with oxygen and water and do not occur in nature as pure elements
Group 2 metals- Alkaline earth metals
Transition elements- Groups 13-18, metals, often form colored compounds
Gold- unreactive and soft- easily shaped
Zinc- used as a coating because it combines with the air for form a protective coating of zinc oxide

4. Metals
Lanthanides are elements after lanthanum and many are used to produce colors on our TV screens
Actinides- follow actinium. All are radioactive and unstable, so they are difficult to research
Ore is a metal compound (mineral) within a mixture of clay or rock.
Mineral is converted to another form through heat.
Metal is then refined into a pure form through chemical reactions

5. Metals Elements beyond Uranium are radioactive-
As # of protons increases, the repulsive force within the nucleus also increases- forces the atom to break apart.
(Radioactive substances are substances in which the nucleus breaks down and gives off particles and energy )