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Assign reasons for the following : (i)...

Assign reasons for the following :
(i) Copper (I) ion is not known in aqueous solution.
(ii) Actinoids exhibit greater range of oxidation states than lanthanoids.

A

the radioactive numberof actinoids

B

actinoid contraction

C

5f, 6d and 7s levels having comparable energies

D

4f and 5d levels being close in energies

Text Solution

Verified by Experts

The correct Answer is:
C
The reason for greater range of oxidation states in actinoid is attributed to the 5f, 6d, and 7s levels having comparable energies.
The 5f-orbitals extend into space beyond the 7s and 6p-orbitals and participate in bonding. This is in direct contrast to the lanthanides where the 4f-orbitals are buried deep inside the atom, totally shielded by outer orbitals and thus unable to take part to bonding.
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