For the First-Row Transition Elements
Element Ionization Enthalpy (kJ/mol) Hydration Enthalpy (kJ/mol)
Standard Reduction Potential (E° M2+/M, V)
Scandium (Sc) 631 -4020 -2.08
Titanium (Ti) 656 -4390 -1.63
Vanadium (V) 650 -4600 -1.18
Chromium (Cr) 653 -4065 -0.91
Manganese (Mn) 717 -3730 -1.18
Iron (Fe) 762 -4410 -0.44
Cobalt (Co) 760 -4240 -0.28
Nickel (Ni) 737 -4040 -0.25
Copper (Cu) 745 -2100 +0.34
Zinc (Zn) 906 -2045 -0.76