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Question is

(i) Write the electronic configuration of Cu2+, Z = 29 for Cu.

(ii) Discuss the oxidation states of lanthanides.

(iii) What is the trend in the ionic radii of transition elements?

(iv) Account for the fact that the second ionisation energies of both chromium and copper are higher than those of the next element.

(v) Why is manganese more stable in the +2 state than the +3 state while the reverse is true for iron?

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