Question

What is lanthanides contraction? What are its consequences?
Explain the formation of coordinate covalent bond with one example.​

Answer 1

Explan

Lanthanide contraction definition in chemistry

In case of lanthanide elements , it has been experimentally found that with increasing atomic number , the atomic and ionic size of lanthanide elements gradually decreases from lanthanum to lutetium.

It is very much regular for lanthanide ions ( Ln 3+) . It will be seen that on going from La 3+ to Lu 3+, the ionic radius shrinks from 115 pm to 93 pm .

The steady decrease in ionic radius all along the series amounting in all to 22 pm , is called lanthanide contraction .

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