Resumen de Lanthanum (La) and Actinium (Ac) Should Remain in the d-block.
This paper discusses the reasons and implications of placing lanthanum (La) and actinium (Ac) in the f-block and lutetium (Lu) and lawrencium (Lr) in the d-block. The author's conclusion is that placing lanthanum (La) and actinium (Ac) in the f-block results in a less satisfactory presentation of the elements in the periodic table and that lanthanum (La) and actinium (Ac) should remain in the d-block below yttrium (Y) in group 3 (IIIB).
