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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).

For more information, see Related Links, below.

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13y ago
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10y ago

-Make the subscript of cation the negative charge of anion.

-Make the subscript of anionthe positive charge of cation.

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14y ago

to establish an ion's elecrical charge

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Q: What is the goal of the criss-cross method in chemistry?
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