The phenomenon called the __________ contraction is responsible for the great similarity in atomic size and chemistry between 4d and 5d elements.

Question

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The lanthanide contraction refers to the phenomenon where the atomic and ionic radii of the lanthanides decrease with increasing atomic number. This contraction is responsible for the similarity in size and chemistry between elements in the 4d and 5d series.

The Phenomenon Called the __________ Contraction Is Responsible for the Great