Scerri, Eric (2022) In praise of chemical triads. Foundations of Chemistry, 24. pp. 285-300. ISSN 1386-4238

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Abstract

The article begins with a response to a recent contribution by Jensen, in which he has criticized several aspects of the use of triads of elements, including Döbereiner’s original introduction of the concept and the modern use of atomic number triads by some authors including myself. Such triads are groups of three elements, one of which has approximately the average atomic weight of the other two elements, as well as having intermediate chemical reactivity. I also examine Jensen’s attempted reconstruction Mendeleev’s use of triads in predicting the atomic weights of three hitherto unknown elements, that were subsequently named gallium, germanium and scandium. The present article then considers the use of atomic number triads, in conjunction with the phenomenon of first member anomaly, in order to offer support for Janet’s left-step periodic table, in which helium is relocated into group 2 of the table. Such a table features triads in which the 2nd and third elements of each group, without fail, fall into periods of equal length, a feature that is absent in the conventional 18-column or the conventional 32-column table. The dual sense of the term element, which is the source of much discussion in the philosophy of chemistry, is alluded to in further support of such a relocation of helium that may at first appear to contradict chemical intuition.

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Item Type:	Published Article or Volume
Creators:	Creators Email ORCID Scerri, Eric scerri@chem.ucla.edu 0000-0001-9775-5829
Keywords:	Triads · Periodic table · Left-step table · First member anomalies · Element
Subjects:	Specific Sciences > Chemistry General Issues > Explanation Specific Sciences > Physics General Issues > Science Education
Depositing User:	Eric Scerri
Date Deposited:	03 Jan 2025 13:55
Last Modified:	03 Jan 2025 13:55
Item ID:	24472
Journal or Publication Title:	Foundations of Chemistry
Publisher:	Springer
Official URL:	https://link.springer.com/article/10.1007/s10698-0...
DOI or Unique Handle:	https://link.springer.com/article/10.1007/s10698-022-09434-x
Subjects:	Specific Sciences > Chemistry General Issues > Explanation Specific Sciences > Physics General Issues > Science Education
Date:	2022
Page Range:	pp. 285-300
Volume:	24
ISSN:	1386-4238
URI:	https://philsci-archive.pitt.edu/id/eprint/24472

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