The Lanthanoid contraction refers to:
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- Ionic radius of the series.
- Explanation:
Lanthanide contraction is a term used to describe the greater than expected decrease in ionic radii of the elements in the lanhtanide series from atomic number 57 i.e. lanthanum to 71 lutetium, which results in smaller than otherwise expected ionic radii for the subsequent elements starting with 72 i.e. hafnium.
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