chemical formula comic strip
Storyboard Text
- 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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