4 4: Observed and calculated values for the standard
electrode potentials
(M2+ ® M°) of the elements Ti to Zn
series is related to the general increase in the sum of the first and second
ionisation enthalpies It is interesting to note that the value of E
V for Mn,
Ni and Zn are more negative than expected from the trend Rationalised 2023-24
99
The d- and f- Block Elements
Element (M)
DDDDDaH
o (M)
DDDDDiH1
o
DDDDD1H2
o
DDDDDhydH
o(M
2+)
E
o/V
Ti
469
656
1309
-1866
-1