Scandium ionization energy

Identify the element with the higher first ionization energy in each of the following pairs (a) scandium and titanium (b) nickel and copper (c) iron and zinc. 

I4.2 k.l mot. the standard enthalpy of formation of ga.seous scandium atoms is r 37ionization energies of scandium are 633. I235 and 23S9 k.l mol Caleuhilc a value for the absolute stantiard enllialpy of liydration of the Se ion. 

In general, ionization energies (M lg) + e ) rise slightly in passing from scandium... 

The values of third ionization energies gradually increase from scandium to zinc, but drop from manganese to iron. The formation of the iron(iii) ion, Fe, involves the removal of an electron from a doubly occupied 3d orbital this electron is more easily removed because it is repelled by the other electron in the orbital (Figure 13.8). 

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