Periodic Table

9.1 The Periodic Table
Core
• Describe the Periodic Table as a method of classifying elements and its use to predict
properties of elements

9.2 Periodic trends
Core
• Describe the change from metallic to non[1]metallic character across a period

Supplement
• Describe and explain the relationship between group number, number of outer-shell electrons and metallic/non-metallic character

9.3 Group properties
Core
• 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

Supplement
• Identify trends in groups, given information about the elements concerned

9.4 Transition elements
Core
• 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

Supplement
• Know that transition elements have variable oxidation states

9.5 Noble gases
Core
• Describe the noble gases, in Group VIII or 0, as being unreactive, monoatomic gases and explain this in terms of electronic structure
• State the uses of the noble gases in providing an inert atmosphere, i.e. argon in lamps, helium for filling balloonsChap#9 Periodic Table