Explain actinoid contraction

The gradual decrease in the ionic radii with increase in atomic number of actinoids. In the actinoid series, the nuclear charge and number of 5felectrons increases by one unit. Hence, the size contraction in actinoids is greater as compared to that in lanthanoids. These 5f orbitals have a poorer shielding effect. The similar concentration in lactinides is called lanthanide contraction.

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