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Medical Term:

Abegg rule

Pronunciation: ab′eg

Definition: the tendency of the sum of the maximum positive and negative valences of a particular element to equal 8; C may have a valence of +4 and −4, O of +6 and −2. Sometimes loosely stated as all atoms have the same number of valences, a consequence of the tendency of valence electron shells to be filled to 8.

[Richard Abegg]