1.

The correct statemet is

Answer»

the earlier members of lanthanoid series RESEMBLE CALCIUM in theirchemicalproperties.
the extent ofactinoid contractionisalmostthe sameaslanthanoid contrction.
in general, Inathnoid and actinoids andactinoids do notshow VARIABLEOXIDATION states.
`Ce^(4+)` inaquesoussoltuion is not known.

Solution :LANTHANOIDS are placaed in the samegroup (2) inwhichtheelement Ca occupies a POSITION. Therefore, theearlier members of theseries resembleCa in theirchemical properties.


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