how do I know the ion value of elements on the production side of the equation when balancing with the electron transfer method?

Elements do not have ion value. Elements have valence, or combining value, for that it is easily figured out from the formula they are in.

See these rules.

http://chemistry.about.com/od/generalchemistry/a/oxidationno.htm

To determine the ion value of elements on the production side of the equation when balancing with the electron transfer method, you need to follow these steps:

1. Start by writing out the unbalanced equation, including the correct chemical formulas for all reactants and products.

2. Identify the atoms of the element you are interested in on both sides of the equation. For example, if you are interested in the ion value of the element oxygen (O), look for O atoms in both the reactants and products.

3. Determine the oxidation state (also known as the ion value or valence) of the element in the reactants. This can often be found in a reference table or through knowledge of common oxidation states.

4. Next, determine the oxidation state of the element in the products. Use the reaction type (such as combustion, reduction, or oxidation) and any other relevant information to determine the change in oxidation state of the element during the reaction.

5. If the oxidation state increases, it means the element has lost electrons and is oxidized. If the oxidation state decreases, it means the element has gained electrons and is reduced.

6. Finally, compare the oxidation states of the element on both sides of the equation. If the oxidation state has increased in the products, assign the appropriate ions to balance the equation by either gaining or losing electrons. The number of electrons gained or lost should be the same as the change in oxidation state.

By following these steps, you can determine the ion value of elements on the production side of the equation when balancing with the electron transfer method.