Classification of Matter Elements Compounds Solution Mechanical Mixtures Groups (Family) Periods Atom Fitting Electrons into Orbits 2, 8, 8, 2 Physical Properties - Colour Physical Properties texture Physical Properties odour Physical Properties lustre Physical Properties-Clarity Physical Properties-Taste Physical Properties-Hardness Physical Properties-Malleability Physical Properties-Brittle Physical Properties-Ductility Physical Properties-Crystal Form Physical Properties - Solubility Physical Properties-Viscosity Physical Properties-Density Chemical Properties-Combustibility Metal reacting with an Acid Physical Change-Change of State Change of State Corrosion Chemical Change New Colour Formed Chemical Change Gas Formed Chemical Change Heat or Light Released (absorbed) Chemical Change Precipitate Formed Sodium Ion Fluoride Sodium Chloride, Salt Acids are Corrosive Acids dissolve in water Acid reacting with a Metal Acids are Sour Acids react with Carbonates The pH Scale