The varying physical and chemical properties of different elements. The principles underpinning the Mendeleev Periodic Table. The Periodic Table: periods and groups; metals and non-metals. How patterns in reactions can be predicted with reference to the Periodic Table. The properties of metals and non-metals. The chemical properties of metal and non-metal oxides with respect to acidity.

To know the simple (Dalton) atomic model, the differences between atoms, elements and compounds, the chemical symbols and formulae for elements and compounds, and thatthe conservation of mass changes of state and chemical reactions.