In the formation of a chemical compound, combinaton takes place between positive and the negative radicals in such a way that the product of valency and the number of radicals is the same for both the radicals. Thus to write the formula of a compound we proceed as follows:

  1. Write the symbols of the two radicals side by side with valencies at the top, the positive radical to the left and negative radical to the right.
  2. Cross the valencies after removing the common factor, if any. The numbers are to be placed to the lower right of each symbol. The compound radical must be enclosed within a bracket and the number placed outside the bracket to the lower right.

Let's take a few examples:

Example 1. For writing the formula of sodium sulphate, proceeding as above instructions state, we have:

  1. Writing symbols side by side with valencies at the top.
  2. There being nothing common in 1 and 2, crossing the valencies we get the desired formula:

More examples coming soon

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