1.

Lantanide series arises due to

Answer»

stability of 6s-orbitals
stability of 5D-orbitals
stability of 4f-orbitals
EQUAL stability of 5d and 4f-orbitals

Solution :We know that, in `6^(th)` row after 6s-orbitals. At this stage 5d-orbitals stop its spliting and 4f-orbitals, split into 7 orbitals, and BECOME lower energy than, 5d-orbitals. Hence 4f-orbital are progressively filled and 14 new ELEMENTS are added called as lanthanides.


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