Question

why do lanthanide form a closely knit group
with similar chemical and physical property
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Answer 1

Answer:

Lanthanides form a closely knit group with similar chemical and physical property because of the tightening between the lanthanides. Explanation: The lanthanides have similar chemical and physical properties as they contract with each other. They have got unpaired electrons in the f-block in the orbit.

Answer 2

I don't know it I can answer