Why are the ionisation energies of 5d-me...

Why are the ionisation energies of 5d-metals greater than those of 3d-metals ?

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In the 5d-series, after lanthanum `(._(57)La)`, there is unexpected in size due to lanthanoid contraction. As a result, the effective pull of nuclear charge on valence electrons is more in the case of 5d-metals than that in 3d-metals. So ionisation energies of 5d-metals are greater than those of 3d-metals.

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