(a) describe the Periodic Table as an arrangement of the elements in the order of increasing protonbr (atomic) numberbr (b) *describe how the position of an element in the Periodic Table is related to proton number andbr electronic structurebr (c) *describe the relationship between group number and the ionic charge of an elementbr (d) explain the similarities between the elements in the same group of the Periodic Table in terms ofbr their electronic confi gurationbr (e) describe the change from metallic to non-metallic character from left to right across a period of thebr Periodic Tablebr (f) *describe the relationship between group number, number of valency electrons and metallicbr non-metallic characterbr (g) *predict the properties of elements in Group I, VII and the transition elements using the Periodicbr Tablebr (a) describe lithium, sodium and potassium in Group I (the alkali metals) as a collection of relatively soft,br low-density metals showing a trend in melting point and in their reaction with waterbr (b) describe chlorine, bromine and iodine in Group VII (the halogens) as a collection of diatomicbr non-metals showing a trend in colour, state and their displacement reactions with solutions of otherbr halide ionsbr (c) describe the elements in Group VIII (the noble gases, also known as Group 0) as a collection ofbr monatomic elements that are chemically unreactive and hence important in providing an inertbr atmosphere, e.g. argon and neon in light bulbs; helium in balloons; argon in the manufacture of steelbr (d) describe the lack of reactivity of the noble gases in terms of their electronic structuresbr (a) describe the central block of elements (transition metals) as metals having high melting points, highbr density, variable oxidation state and forming coloured compoundsbr (b) state the use of these elements andor their compounds as catalysts, e.g.