Ba(ClO3)2 → ____ + 3O2

In one or two sentences, identify the type of reaction that is occurring and identify the other product. Based on the subscripts of the elements in the other product and the fact that chlorine has seven valence electrons, determine the number of electrons in barium’s (Ba) outer shell.

This is a decomposition reaction, where Ba(ClO3)2 is breaking down into Ba and ClO2. The number of electrons in barium's outer shell is 8.