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The crossover method for chemistry balances formula units... it's simple once you know how to do it.
Here are the steps for the cross over method:
Step 1 - In the ionic compounds to be learnt in junior science, there are two parts to the ionic compound - the first is a positive ion (usually a metal e.g. Na1+) and the second is a negative ion (e.g. Cl1-).
Step 2 - Using the valency table, write the two ions and their valencies.
Step 3 - Now ignore the positive and negative signs. Cross-over the top valency number to the bottom of the other ion symbol. Do this for both.
Step 4 - Write the completed formulae with those same numbers at the bottom.
Step 5 - If the numbers on each part are the same (e.g. Na1 Cl1 or Mg2 O2), ignore them and rewrite the formulae without them (e.g. Na Cl or Mg O).
Step 6 - Brackets may be used around radicals (groups of atoms that are charged e.g CO3).
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JudyThe criss-cross method is used to determine the chemical formula of an ionic compound by balancing the charges of the ions. It involves taking the numerical charges of the ions and crossing them over to become subscripts in the final formula. The goal is to ensure that the total positive charge from the cations balances the total negative charge from the anions in the compound.
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The crisscross method uses the oxidation state (valence) of each element or ion. In this example, aluminum (Al) has an oxidation number of 3+. Nitrogen has an oxidation number of 3-. So, there really is no crisscross, because they are both the same, and they would combine to make aluminum nitride, AlN. If, however, you had aluminum, and nitrate ion (NO3^-), the crisscross would be to make the Al subscript a 1 and the NO3- subscript 3 to give Al(NO3)3.
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