Elements, Compounds and Mixtures

1. Elements

> An element is a pure substance that cannot be broken down into two or more simpler substances by chemical processes. 

> Properties of metals:

• Shiny (lustrous)
• Mostly solid at r.t.p (exc. for mercury)
• High melting / boiling points (exc. for Na, K, Hg)
• Ductile (can be drawn into wires)
• Malleable (can be hammered into different shapes without breaking)
• Sonorous (makes a ringing sound when struck)
• Good heat conductivity 
• Good electrical conductivity 

> Properties of metalloids (elements that exhibit both metallic and non-metallic properties)

• Shiny
• Solids at r.t.p
• High melting / boiling points 
• Brittle (easily broken when hammered)
• Moderate heat conductivity 
• Moderate electrical conductivity

> Properties of non-metals

• Dull
• Gases…