valence shell
1.On the basis of the Valence Shell electron Pair repulsion theory, we have justified bond angles in AB_(4-n) molecules depend on the bond parameter Z~(*2)/r_k of thebonding atoms A and B. Formulas for calculation of the bond angles of AX_3 and AH_(4-n) molecules of the VA、VIA group elements are proposed and extended.
3.A functional-link net(FLN) was employed to correlate a set of atomic structural descriptors, such as electric charges ( Z), ionic radii ( r), electron numbers in the valence layer (f, d, s) , principal quantum numbers in the outer-shell ( n ) , electronegativity (xp ) , and the factor of adaptive valence orbit number(w) of the metal ions with known stable constants (logK) of ethylenediamine tetraacetic acia complexes of 60 metal ions.
