Question

What is lanthanoid contraction​

Answer 1

Answer:

the filling up of 4f orbitals before 5p orbitals results in decrease in size of lanthanoids across period. This is called lanthanoid contraction

Answer 2

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The lanthanide contraction is the greater-than-expected decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, which results in smaller than otherwise expected ionic radii for the subsequent elements starting with 72, hafnium