In the transition series,starting from lanthanum (._(57)La), the next – InterviewSolution

1.	In the transition series,starting from lanthanum (._(57)La), the next elements hafnium (._(72)Hf), has an atomicnumberof 72. Why do weobserve this jump in atomic number ?
Answer» Solution :This is because after `._(57) LA`, filling of 4 f-orbitalstarts which is complete at atomic NUMBER 71.These 14 elements , THEREFORE, BELONG to f-block and placedseparately at the bottom of the periodic table.

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