Except La3+, Ce4+ and Yb2+, Lu3+ all lanthanoids are paramagnetic. Why?
The paramagnetic property is because of the unpaired electron. La3+ and Ce4+ have 4f0 configuration whereas Yb2+ and Lu3+ have 4f14configuration, which makes all these four deficient of unpaired electrons and thus they all are diamagnetic whereas all rest of the lanthanoids have atleast one or more unpaired electron which makes them paramagnetic.
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