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

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The discussion centers on the comparison of filling electron orbitals, specifically the sequence of n=5 and n=6 orbitals versus n=4 orbitals. It highlights that n=4 orbitals are significantly smaller and closer to the nucleus, yet they possess higher energy than the n=5 and n=6 orbitals. This raises questions about the concept of localization in relation to these orbitals. Additionally, the conversation touches on reactivity, questioning what the n=4 orbitals are less reactive compared to, given their energy levels and size. Overall, the dialogue emphasizes the intricate relationship between orbital size, energy, and reactivity in atomic structure.
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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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