Question

# What is lanthanoid contraction? Mention one of its consequences.

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Hint:
Victor Goldschmidt gave the term Lanthanoid contraction in 1925. There are a total of 15 elements in the lanthanide series. It shows some peculiar properties such as a decrease in the ionic radius.

-The lanthanide have the general configuration of $\text{5}{{\text{f}}^{1-14}}6{{\text{d}}^{1}}\text{7}{{\text{s}}^{2}}$.