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U1.1 FORMULAE AND SYMBOLS
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A substance is defined by the atom structure.

A formula is a shorthand way of representing a substance. It uses symbols for the different atoms:



Atom Symbol
Carbon C
Calcium Ca
Hydrogen H
Oxygen O
Sodium Na
Lead Pb
Copper Cu
Potassium K
Chlorine Cl
Nitrogen N
   


Notes: see Teachers’ Guide
 
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