Which of the following statements are CORRECT regarding the positions and distribution of elements i — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

Lanthanoids ($Z=58-71$) and Actinides ($Z=90-103$) are inner transition elements placed at the bottom of the table but officially belong to Group 3 (IIIB). The 6th period has $2(s) + 14(f) + 10(d) + 6(p) = 32$ elements. Since Group 3 contains $Sc$, $Y$, 14 Lanthanoids, and 14 Actinides, it holds $1+1+14+14 = 32$ elements, the maximum for any group. Actinides are in Group 3, not 4.