2.1 Elements

Chemical symbol– international symbol for each element consisting of one or two letters Physical properties– characteristics like state and colour Chemical properties– a substance’s ability to react chemically with other substances to form new products (reactivity) Metals – usually hard, shiny, malleable, ductile and good conductors of heat and electricity Non-metals – usually gasses or brittle solids at room temperature

 Colourless, odourless, tasteless and highly flammable gas  Highly reactive and lighter than air

- Very strong metal and ductile but can rust when exposed to water and oxygen

 Non-metal gas that reacts with most other elements

 Shiny soft metal that is highly reactive in water and air

 Pale, yellow-green gas that is deadly and highly reactive

 A liquid metal that is poisonous and carcinogenic

 White metallic element that can be polished, moulded, stretched, and is malleable and ductile  Also reflective and has great thermal conductivity

 Brittle, grey and has a metallic lustre although it is not a metal  Used as a semi-conductor