1.

Lanthanoidsare

Answer»

14 elementsin thesixthperiod(atomicno= 90 to103 ) thatare filling4f- sublevel
14elementsin theseventhperiod ( atomicno= 90to 103 ) that arefilling 5f-sublevel
14 element in the SIXTH period( atomicno = 58to 71 )that arefilling4f- sublevel
14elementsin theseventhperiod( atomicno =58to 71 )that arefilling4f- sublevel

Solution :NA


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