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(C) Lanthanoid contraction is the steady decrease in the atomic and ionic radii of lanthanoids with an increase in atomic number. This is primarily du

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Effective nuclear charge

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(C) Lanthanoid contraction is the steady decrease in the atomic and ionic radii of lanthanoids with an increase in atomic number. This is primarily due to the poor shielding effect of $4f$ electrons. As the atomic number increases,the nuclear charge increases by one unit at each step,but the additional electron enters the $4f$ orbital. Since $4f$ electrons have a very poor shielding effect,the effective nuclear charge experienced by the outer electrons increases,causing the electron cloud to be pulled closer to the nucleus,resulting in a decrease in size.

Lanthanoid contraction is caused due to an increase in . . . . . . .

Similar Questions

Compare the chemistry of the actinoids with that of lanthanoids with reference to:
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