According to the rule, difference between the maximum positive and negative valence of an element is frequently eight. For example, sulfur in H2S has oxidation state ?2 and +6 in H2SO4. -2 + (+6) equals 8.
ABEGG’S RULE OF EIGHT: “Abegg’s rule of eight was defined by German chemist Abegg.”
Solubility of alkali salts of strong acids in water decrease with increase in atomic mass of elements, while the solubility of alkali salts of weak acids increase with increase of atomic mass of elements in periodic table.
ABEGG’S RULE: “Abegg’s rule is formulated in 1904.”