Question

we require ________ for writing a chemical formula​

Answer 1

Answer:

Valency I think

Explanation:

Uhuovouv

Answer 2

Answer:

Valency

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.

Hope it helps you :)☺