Posted by **Shanda** on Monday, March 29, 2010 at 1:40pm.

When determining the formula for a compound, it is important to know the valence numbers of each element. Suppose that "element A" has a valence number of 3 and "element B" has a valence of 2. If the two elements combine, then when writing the formula for the resulting compound what subscript number will be given to "element B".

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