Question

what is lantanoide concentration? why it arise?

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Answer 1

The size of M2+ ions decreases as we move through the lanthanides from lathanum to lutetium. This steady decrease in ionic radii of M3 cations in the lanthanides. series is called lanthanide contraction.

The influence of f-orbitals on the chemical attributes of the REEs observed by the regular decrease in the ionic radii on progression from La to Lu (Table 1). The so-called “Lanthanide Contraction” arises because of (i) the incomplete electric field shielding by the f-orbitals and (ii) unit increases in nuclear charge.