Abegg's rule is a principle in chemistry that relates to the distribution of electrons in the outer shells of atoms, particularly regarding the valency of elements and their tendency to form chemical bonds. It states that the sum of the maximum positive and negative valences of an element is equal to eight. In other words, if an atom can exhibit a maximum oxidation state (positive valence) and a maximum state of reduction (negative valence), the values of these two states will sum to eight.
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