Why it is witten 123 in all brakets...!!!!
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Answer:
They are telling that there are 1 , 3 ... atoms or molecules in it
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1
Answer:
Because they are shown as Isotopes
Explanation:
For Example: Fe(OH)3...
As iron is the name of "Fe" element and being negative part OH is written as "hydroxide" and as the charge of Fe is +3, hence, in the bracket, III is written in roman.
Similarly, All the elements are written in brackets to show their valency
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