Mantion any two importen rules for writing chemical formula
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Answer:
their symbol and theri valancy
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Answer:A) You should know the valencies of the elements which you want to make formula. Ex) Mg2+O2-=MgO(magnesium oxide)
B) You want to cross multiple the valencies of each element where you know in place of tetravalency you should place bracket.
Explanation:
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