2. What is Electrochemical factor -Electronegativity X X represents the ability of an atom of an element in the compond to attract electrons to itself Paul's empirical rule: X=0.37+ +0.5 n: valence rO: simple bond radius2. What is Electrochemical factor —— Electronegativity X X represents the ability of an atom of an element in the compond to attract electrons to itself. Pauli’s empirical rule: 0.5 1 0.31 (1) + + = r n X n: valence r(1): simple bond radius