Chemical formula of a compound is a symbolic representation of its composition.

Q. Chemical formula of a compound is a symbolic representation of its composition.
We should know the following points to write the chemical formulae of chemical compounds :
(i) Symbols of the combining elements.
(ii) Valency of the combining elements.
In order to know the valency, we must calculate the valence electrons present in the atoms. The electrons present in the outermost shell or valence shell are called valence electrons. The number of electrons in the atoms of some elements are given below. The elements which have one valency are called monovalent.
(a) What is a chemical formula ?
(b) Which main points we must know to write the chemical formula of compounds ?
(c) Which values do we find associated with the use of formula for various things in daily life ?
Ans. (a) Chemical formula of a compound is a symbolic representation of its composition.
(b) Symbols and valencies of combining elements.
(c) Use of formula is not confined only to chemistry. Use of various formulae and ideas help us in finding solutions to many complicated problems in daily life. It helps in saving time, money and energy. It brings simplicity working on similar lines or suggested by others we find easy, systematic and valuable approach to overcome strifes of life.

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