GKFix MCQ Question

What is the effect of Lanthanoid contraction?

• A. It increases atomic radii.
• B. It causes a decrease in atomic and ionic radii of the elements following the lanthanoids (from La to Lu), making them smaller than expected and similar in size to the elements above them in the periodic table.
• C. It affects only the lanthanoids themselves.
• D. It increases the reactivity of lanthanoids.