Question

Mention any 2 rules for writing formulas

Answer 1

Answer:

Rules for writing a chemical formula

• Write down the symbols of the elements / ions, which combine to form a molecule of the compound, side by side. ...

• Write the valency of each element / ion.

• Interchange the valencies of the elements / ions and write as the subscript. ...

• The radical / polyatomic ions must be written in brackets, before the subscript is written.

Answer 2

Explanation:

The rule for writing chemical formula is as follow:

Firstly, write the symbols with positive charge valency first. Secondly, write the valency of each atom on the top of its symbol. Thirdly, divide the valency number by their highest common factor ignore the positive or negative radicle. Interchange the valency of the radicle. Lastly, write the interchanged valency number to the lower right of the radicle.