The formula for Pentaamminechlorochromium(III) chloride is [Cr(NH3)5Cl]Cl2.
Write down the symbols of the elements, which combine to form a molecule of the compound, side by side. Remember 2 metals don't join up to form compounds. Always write metals first and non metals next.
Write the valency of each element.
Interchange the valencies of the elements / ions and write as the subscript.
Whenever applicable, write simple ratios of the valencies.
The final formula must be written without any sign of the charge.
Example,
Acetic acid formula CH3COOH
Aluminium hydroxide formula Al(OH)3
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