The positions of lanthanum (actinium) and lutetium (lawrencium) in the periodic table: an update
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This article updates the author’s 1982 argument that lutetium and lawrencium, rather than lanthanum and actinium, should be assigned to the d-block as the heavier analogs of scandium and yttrium, whereas lanthanum and actinium should be considered as the first members of the f-block with irregular configurations. This update is embedded within a detailed analysis of Lavelle’s abortive 2008 attempt to discredit this suggestion.
KeywordsPeriodic table Group 3 Lanthanum Lutetium Actinium Lawrencium
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