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Separation of lanthanoid elements is dif...

Separation of lanthanoid elements is difficult. Why ?

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Reason of lanthanoid contraction is-

Assertion (A) : Separation of Zr and Hf is difficult. Reason (R ) : Zr and Hf lies in the same group of the periodic table.

For which of the following elements it is difficult to disproportionate in +3 oxidation state -

Write down the names of the lanthanoid elements which show + 4 and + 2 oxidation states. Correlate this type of behaviour with the electronic configuration of these elements.

Why is electronic configuration of transition elements irregular ?

Explain why electronic configurations of lanthanoids are not known with certainty.

Name one lanthanoid element which has radioactive nature.

Electron affinity of inert elements are positive. Why?

The chemistry of the actinoid elements is not so smooth as that of the lanthanoids. Justify this statement by giving some examples from the oxidation state of these elements.