\ ˈä-ˌbegz- 
, -ˌbeks- \
, -ˌbeks- \Medical Definition of Abegg's rule
: a rule in chemistry: for a given chemical element (as sulfur) the sum of the absolute value of its negative valence of maximum absolute value (as −2 for sulfur in H2S) and its positive valence of maximum value (as +6 for sulfur in H2SO4) is often equal to 8
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