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Actinoids in general have which characteristic that distinguishes them from lanthanoids?
AActinoids are non-radioactive
BActinoids show a wider range of oxidation states (up to +7 in Np); they are all radioactive; 5f electrons can participate in bonding more than 4f
CAll actinoids exhibit only +3 state
DActinoids are gases
Answer & Solution
Correct answer: B. Actinoids show a wider range of oxidation states (up to +7 in Np); they are all radioactive; 5f electrons can participate in bonding more than 4f
**Actinoids vs lanthanoids**: actinoids show **wider range of oxidation states** (+3 to +7; max +7 in Np), are **all radioactive**, and have **5f electrons less buried** than 4f → more bonding participation. Actinoid contraction is **larger** than lanthanoid contraction (poorer 5f shielding).
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