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CBSE Class 9 Answered

how to write formulae of simple compounds?
and how to write the valency while writing the symbols of some common,simple and polyatomic ions?
Asked by Nandhini Jagadeesan | 07 Feb, 2016, 11:14: AM
answered-by-expert Expert Answer

Writing Chemical Formulae

Step 1 :  Write the symbol of a basic radical (element with the positive valency) to the left hand side and that of the acid radical (element with the negative valency) to 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 receive a valency number more than 1, enclose it within the brackets.

Answered by Prachi Sawant | 08 Feb, 2016, 11:26: AM
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