Steps involved in writing a chemical equation are:
1. Write the symbols out there formulae of the reactants in the left hand side, with a (+) sign between them.
2. Write the symbols or the formulae of the products on the right hand side, with a (+) sign between them.
3. Put the sign of an arrow (-->) in between the reactant side and the product side.
4. Represent the reactants and the products in their molecular forms [because their atomic forms are usually neither stable not capable of separate existence].
HOPE IT HELPS U :-)