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प्रश्न
Answer the following
Why nobelium is the only actinoid with a +2 oxidation state?
उत्तर
i. The electronic configuration of nobelium (No) is [Rn] 5f14 6d0 7s2.
ii. After losing 2 electrons No forms No2+ ion, which is stable due to completely filled 5f-orbitals.
iii. Such extra stability due to completely filled orbital is not acquired by any other actinoid in their +2 oxidation state.
Hence, nobelium is the only actinoid with a +2 oxidation state.
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