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Why do metals in the 5d transition serie...

Why do metals in the 5d transition series (for example, Pt, Au, Ir etc) not corrode?

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5d-metals have very high ionization energy values due to lanthanide contraction, so they do not corrode.
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(a) Why do transition metals and their compounds are found to be good catalysts? (b) The 5d series of transition metals have more frequent metal-metal bonding in their compounds than do the 3d and 4d metals. Explain. (c ) Why do transition metals form complexes? (d) Explain why Cu^+ ion is not stable in aqueous solution. (e ) Why is europium (II) more stable than cerium (II)?