The Periodic Table of Elements

Describe the Periodic Table as a method of classifying elements and its use to predict properties of elements.
Describe the change from metallic to nonmetallic character across a period.
Describe and explain the relationship between Group number, number of outer shell electrons and metallic/non-metallic character.
Describe lithium, sodium and potassium in Group I as a collection of relatively soft metals showing a trend in melting point, density and reaction with water.
Predict the properties of other elements in Group I, given data, where appropriate