14/8/2011
Chemistry Revision
Periodic Table(1st 20 element)

Definition of an element: An element is a pure substance which cannot be further broken down into simpler substance by any chemical reaction.It is the simplest form of matter.
Memorize:
Hydrogen,helium,lithium,beryllium,boron,carbon,nitrogen,oxygen,fluorine,neon,
sodium,magnesium,aluminium,phosphorus,sulfur,chlorine,argon,potassium,calcium

The metals are lithium beryllium,sodium,magnesium,aluminium,potassium,calcium
A horizontal row in the periodic table is called period
A vertical column in the periodic table is called group
Vertical column has the similar properties
Horizontal row has a gradual change of metallic properties from the left to non-metallic properties to the right
Properties of metal

• Shiny Appearance
• Malleable and Ductile and Brittle
• High melting and boiling point(except for sodium.potassium and mercury)
• Solid at room temperature and pressure(except mercury)
• Good Conductor of Heat and Electricity