Question

how to write the chemical formula of any chemical?

Answer 1













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For example in formulas and equations, the chemical formula for water is H2O which indicates that 2 atoms of Hydrogen combines with 1 atom of oxygen. The chemical formula for sodium chloride is NaCl indicating that one atom of sodium combines with one atom of chlorine in a one-to-one ratio.

Answer 2

firstly you should know the Valency of element

then just use criss cross method .

valiancy= the combining capacity of an atom of elements is called valiancy
Jo atom last shell mein hota hai usse valency kahte hai .


for example
hydrogen ka valence 1 hai aur oxygen ka 2
h¹and 0²
cross hua toh
h20 cross ho gaya na oxygen ka Valencia hydrogen pe