Chapter : 3. Atoms & Molecules
Writing the formula of a compound
Writing the formula of a compound
Step-1 :
Write the symbols of formulae of the ions of the compound side by side with positive ion on the left hand side and negative ion on right hand side.
Step-2 :
Enclose the polyatomic ion in a bracket.
Step-3 :
Write the valency of each ion below its symbol
Step-4 :
Reduce the valency numerals to a simple ratio by dividing with a common factor, if any.
Step-5 :
Cross the valencies. Do not write the charges positive or negative of the ions.
Example. Formula of barium nitrate.
Step-1 : Writing the formula of the ions :
Ba2+ NO3–
Step-2 : Ba2+ (NO3)–
Step-3 : Ba2+ (NO3)–
2 1
Step-4 : Not applicable, because ratio is already simple
Step-5 :
Thus, the formula of barium nitrate is Ba(NO3)2
Step-1 :
Write the symbols of formulae of the ions of the compound side by side with positive ion on the left hand side and negative ion on right hand side.
Step-2 :
Enclose the polyatomic ion in a bracket.
Step-3 :
Write the valency of each ion below its symbol
Step-4 :
Reduce the valency numerals to a simple ratio by dividing with a common factor, if any.
Step-5 :
Cross the valencies. Do not write the charges positive or negative of the ions.
Example. Formula of barium nitrate.
Step-1 : Writing the formula of the ions :
Ba2+ NO3–
Step-2 : Ba2+ (NO3)–
Step-3 : Ba2+ (NO3)–
2 1
Step-4 : Not applicable, because ratio is already simple
Step-5 :
Thus, the formula of barium nitrate is Ba(NO3)2
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