Which among the following properties of lanth | vedclass

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(C) Lanthanoids are metallic in nature and are good conductors of heat and electricity.Most lanthanoid ions are paramagnetic due to the presence of un

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These all are non-radioactive

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(C) Lanthanoids are metallic in nature and are good conductors of heat and electricity.Most lanthanoid ions are paramagnetic due to the presence of unpaired $4f$ electrons.Lanthanoids generally exhibit high coordination numbers,typically greater than $6$ (often $8$ or $9$).However,the statement that 'all lanthanoids are non-radioactive' is incorrect.Promethium ($Pm$,atomic number $61$) is a well-known radioactive element among the lanthanoids.

Which among the following properties of lanthanoids is $NOT$ true?

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