DRAGOS E-PARAMETER, C-PARAMETER AND T-PARAMETER FOR SOME MONOVALENT-METAL AND BIVALENT-METAL IONS - LACK OF CORRESPONDENCE WITH PEARSONS CHEMICAL HARDNESS

Drago's e, c and t parameters for a number of chemically important mon o- and bivalent metal ions are estimated from the heterolytic bond dis sociation energy data of their binary halides, hydrides and methides. An important result is that, for the cationic acids, the c and t param eters are not two independent variables. Attempts to correlate these p arameters or any combination of these with Pearson's chemical hardness have been unsuccessful so far.