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  • Today we will be learning about chemical formulas.
  •  Writing Chemical formula :RULE I: Cross multiply the valencies of the elements to form the formula of the respective compound.
  • In the above formulas Rule I is followed i.e. cross multiply the valencies of the elements to form the formula of the respective compound.
  • RULE II: If a compound consists of both metallic as well non-metallic elements then name or symbol of the metal is considered first.
  • RULE III: In case compounds are formed from polyatomic ions then the ion is enclosed in a bracket before writing the number to indicate the ratio. But in case the number of polyatomic ion is one then there is no need for bracket.
  • Example : Magnesium chloride
  • FORMULA MgCl2 
  • SYMBOL Mg Cl VALENCY 2 1
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