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What is lanthanoid contraction? What are...

What is lanthanoid contraction? What are the consequences of lanthanold contraction?

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The decrease in size with increase in atomic no among lanthanoids iscalled lanthanoid contraction it is due to the fact that 5f,6d and 7s levels are of comparable energies consequences :
(i) similar chemical and physical properties among lanthanoids
(ii) Elements of 2nd and 3rd d series exhibit similar radil
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XII BOARDS PREVIOUS YEAR-XII BOARDS-C.B.S.E CLASS XII
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