Question: The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :
decrease in both atomic and ionic radii
increase in atomic radii and decrease in ionic radii
increase in both atomic and ionic radii
decrease in atomic radii and increase in ionic radii
Correct Option: 1
Solution:
Due to Lanthanoid contraction both atomic radii and ionic radii decreases gradually in the lanthanoid series.
