Elements - Periodic Table

Elements

117 Elements in the periodic table
Each has its own chemical symbol -  2 letters
eg Oxygen =O, Carbon = C, Iron = Fe, Aluminium = Al

Carbon + oxygen = carbon dioxide
Sodium + Chlorine = sodium chloride
Magnesium + Oxygen = magnesium oxide

Compounds

Elements which are joined together
Name tells you what elements it is made of
Compounds made of 2 elements always end in -ide

Some elements are also made of molecules
eg
A molecule of oxygen = 2 oxygen atoms

Water is made up of two atoms of hydrogen and one of oxygen - the formula is H2O

Metals

Good conductors of heat
Shiny
Solids with high melting point (except mercury)
Mainly found on the left hand side and centre of the periodic table
Flexible

Non-Metals

Poor conductors of heat and electricity
dull
most are solids or gases
found on the right hand side of the periodic table
not magnetic
brittle