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(B) The main reason for actinoids exhibiting a larger number of oxidation states compared to lanthanoids is the smaller energy difference between the

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lesser energy difference between $5f$ and $6d$ than between $4f$ and $5d$ orbitals

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(B) The main reason for actinoids exhibiting a larger number of oxidation states compared to lanthanoids is the smaller energy difference between the $5f$ and $6d$ orbitals compared to the energy difference between the $4f$ and $5d$ orbitals.Because the $5f$,$6d$,and $7s$ orbitals in actinoids have comparable energies,electrons from these orbitals can participate in bonding,leading to a wider range of oxidation states.

Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids,the main reason being

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