CBSE Class 9 Answered
What are the rules for writing the chemical formulae?
Asked by Topperlearning User | 30 Mar, 2016, 10:35: AM
Expert Answer
Rules for writing the chemical formulae
Step 1 : Write the symbol of a basic radical (element with a positive valency) on the left hand side and that of the acidic radical (element with a negative valency) on the right hand side.
Step 2 : Write the valency number/charge of each of the respective ions at the bottom of its symbol.
Step 3 : Interchange the valency number. Ignore the (+) and (-) sign.
Step 4 : Write the interchanged number.
Step 5 : Write the compound’s formula.
Step 6: Cross the reduced valencies. If 1 appears, ignore it. And if a group of atoms receives a valency number more than 1, enclose it within brackets.
Answered by | 30 Mar, 2016, 12:35: PM
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