American Huilin Institute http://www.amhuilin.com/
Fierro  commented in a reference and textbook, “Metal Oxides: chemistry and application
s” :“Modern theories of reactivity propose to consider the oxidizing power, acidity, basicity, a
nd reducing power, as steps along a same continuum, instead of distinct phenomena. Among
parameters, Zhang’s scale of electronegativity [15, 16], optical electronegarivity and optical b
asicity [79, 80], electronic polarizability , Racah parameter , and ionic covalent param
eter (ICP) [48, 50], were used recently to quantitatively describe the acid (base) or redox beha
vior of oxides in various application. General correlations of catalytic activity, with, for exam
ple, Me-O bond strength, electronegativity or oxygen partial charge, are numerous.
 Y. Zhang,, Inorg Chem., 1982, 21, 3886;
Y. Zhang,, in "Introduction to Modern Inorganic Chemistry" ( Eds: K. M. Mackay,
R. A. Mac
kay, W.Henderson, ) 6th ed., Nelson Thornes, United Kingdom,2002, pp 53-54).
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 J.L.G. Fierro editor, “Metal Oxides: chemistry and applications”, CRC Press, Boca
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