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Comment on the following: (i) Zr and Hf have similar sizes(ii) Actinones show greater no. of oxidation state than Lanthanones. |
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Answer» (i) As a consequence of Lanthanoid contraction Zr and Hf have similar sizes. (ii) As energies of 5f, 6d and 7s are comparable therefore electrons can easily be promoted from lower to higher orbital, hence more no. of oxidation states are shown. Another reason is that the 5f electrons are available for bonding unlike 4f in lanthanides. |
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