Elements - Periodic Table

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Elements

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

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Compounds

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

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Metals & Non Metals

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

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