Unit 3 Content Check

Alkali metals

Very reactive, especially with water, very soft. Melt at low temp.

Alkaline Earth Metals

Reactive, elements have two valence electrons. Oxides yield an alkaline or basic solution when dissolved in water.

Transition metals

Hard and shiny. Have high melting point. Good conductors of heat and electricity. Maleable.

Halogens

Very active non-metals. Combine with metals to form salts. 7 valence electrons, very reactive. Diatomic molecules

Noble Gasses

Rarely combine, exist in atmosphere. Outer levels full, tend to not be very reactive. They used to be called inert. Very low melting and boiling points.

Metalloids

Semi conductors. Poor conduction, better as temp rises.

Lanthanides/actinides

Both are silver, white, or gray metals. High conductivity.

Lanthanides

Soft, high melting and boiling points. Very reactive and used for lasers.

Actinides

Very dense radioactive metals that combine directly with most non-metals.