Why do the d, f orbitals of transition metals have less reactivity?

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The discussion centers on the reactivity of transition metals, specifically addressing why the d and f orbitals exhibit lower reactivity. It highlights that the 4d and 4f orbitals are smaller and more localized compared to the 5s and 6s orbitals, which are higher in energy. This localization contributes to their reduced reactivity, as the electrons in these orbitals are held more tightly by the nucleus. The conversation also raises questions about the comparative reactivity of these orbitals against other electron configurations.

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MophiA
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Thinking about filling sequence 5s -> 4d or 6s -> 4f, the n=4 orbitals are way smaller than n=5 or 6.

Does this mean "localized"?

Even though the n=4 orbitals are way smaller, close to nucleus, these orbitals have more energy than n=5, 6 orbitals above.

What makes it less reactive?
 
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less reactive compared to what?
 

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