More is the number of poor shielders, greater will be Zeff and hence, smaller is the size. Actinoids consists of more no. of poor shielders (3d,4d,5d,4f). Therefore, size continuously decreases left to right.
Decrease in size from left to right in actinoid series is greater and gradual than that in lanthanoid series due to:
Held on 30 Apr 2022 · Verified 9 Jul 2026.
4f orbitals are penultimate
4f orbitals have greater shielding effect
5f orbitals have poor shielding effect
5f orbitals have greater shielding effect
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