Ionization Energy
The ionization energy (IE) of transition elements are higher than those of s-block elements but lower than p-block elements. In a particular transition series, ionization energy although increases gradually as we move from left to right but this increase is not appreciable.
The increase in ionization energy is due to increase in nuclear charge, the effect of increase in nuclear charge is partly balanced by the increase in screening effect. Consequently, the increase in ionization energy along the period of d-block elements is very small.
Illustration 4:K2PtCl6 is a well known compound whereas corresponding Ni compound is not known. State a reason for it.
Solution:This is because Pt4+ is more stable than Ni4+ has the sum of four ionization energies of Pt is less than that of Ni.
Exercise 1:Most of the transition metals do not displace hydrogen from dilute acids. Why?
Exercise 2:Why are the ionization energies of 5d elements greater than 3d elements?
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