2.1 Understand the terms 'group' and 'period'
2.2 Recall the positions of metals and non-metals in the Periodic Table
2.3 Explain the classification of elements as metals or non-metals on the basis of their electrical conductivity and the acid-base character of their oxides
2.4 Understand why elements in the same group of the Periodic Table have similar chemical properties
2.5 Recall the noble gases (group 0) as a family of inert gases and explain their lack of reactivity in terms of their electron configurations
2.6 Describe the reactions of these elements with water and understand that the reactions provide a basis for their recognition as a family of elements
2.7 Recall the relative reactivities of the elements in Group 1
2.8 Recall the colours and physical states of the elements at room temperature
2.9 Make predictions about the properties of other halogens in the group
2.10 Understand the difference between hydrogen chloride gas and hydrochloric acid
2.11 Explain, in terms of dissociation, why hydrogen chloride is acidic in water but not in methylbenzene
2.12 Recall the relative reactivities of the elements in Group 7
2.13 Describe the experiments to show that a more reactive halogen will displace a less reactive halogen from a solution of one of its salts
2.14 Understand these displacement reactions as redox reactions
2.15 Recall the gases present in air and their approximate percentage by volume
2.16 Describe how experiments involving the reactions of elements such as copper, iron and phosphorus with air can be used to determine the percentage by volume of oxygen in air.
2.17 Describe the laboratory preparation of oxygen from hydrogen peroxide
2.18 Describe the reactions with oxygen in air of magnesium, carbon and sulphur and the acid-base character of the oxides produced
2.19 Describe the laboratory preparation of carbon dioxide from calcium carbonate and dilute hydrochloric acid
2.20 Describe the formation of carbon dioxide from the thermal decomposition of metal carbonates such as copper (II) carbonate
2.21 Describe the properties of properties of carbon dioxide, limited to its solubility and density
2.22 explain the use of carbon dioxide in carbonating drinks and fire extinguishers, in terms of its solubility and density
2.23 Recall the reactions of carbon dioxide and sulphur dioxide with water to produce acidic solutions
2.24 Recall that sulphur dioxide and nitrogen dioxides are pollutant gases which contribute to acid rain, and describe the problems caused by acid rain