Periodic Table

C8.1 Arrangement of elements 1 Describe the Periodic Table as an arrangement of elements in periods and groups and in order of increasing proton number/atomic number 2 Describe the change from metallic to non-metallic character across a period 3 Explain similarities in the chemical properties of elements in the same group of the Periodic Table in terms of their electronic configuration 4 Identify trends in groups, given information about the elements C8.2 Group I properties 1 Describe the Group I alkali metals, lithium, sodium and potassium, as relatively soft metals with general trends down the group, limited to: (a) decreasing melting point (b) increasing density (c) increasing reactivity with water 2 Predict the properties of other elements in Group I, given information about the elements C8.3 Group VII properties 1 Describe the Group VII halogens, chlorine, bromine and iodine, as diatomic non-metals with general trends down the group, limited to: (a) increasing density (b) decreasing reactivity 2 State the appearance of the halogens at room temperature and pressure, r.t.p., as: (a) chlorine, a pale yellow-green gas (b) bromine, a red-brown liquid (c) iodine, a grey-black solid 3 Describe and explain the displacement reactions of halogens with other halide ions 4 Predict the properties of other elements in Group VII, given information about the elements C8.4 Transition elements 1 Describe the transition elements as metals that: (a) have high densities (b) have high melting points (c) form coloured compounds (d) often act as catalysts as elements and in compounds C8.5 Noble gases 1 Describe the Group VIII noble gases as unreactive, monoatomic gases and explain this in terms of electronic configuration