@chemfiesta_by_ek: From Valency to Chemical Formula! Master the Criss-Cross Method with Simple Steps and Examples. Writing chemical formulae using valency involves balancing the combining capacities of positive and negative ions. Follow these steps: 1. Write the symbols of the positive and negative ions. 2. Write their valencies. 3. Criss-cross the valencies to become subscripts. 4. Simplify the subscripts to the smallest whole-number ratio. 5. Use brackets when more than one polyatomic ion is required. Remember: The final formula must have an overall charge of zero. #chemistry #formula #writing #criscros #method

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Friday 30 October 2026 10:05:06 GMT