09. The Periodic Table

• 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

• Describe the halogens, chlorine, bromine and iodine in Group VII, as a collection of diatomic

non-metals showing a trend in colour and density and state their reaction with other halide ions

• Predict the properties of other elements in Group VII, given data where appropriate

• Identify trends in Groups, given information about the elements concerned

• Describe the transition elements as a collection of metals having high densities, high melting points and forming coloured compounds, and which, as elements and compounds, often act as catalysts

• Know that transition elements have variable oxidation states