Affiliation:
1. Department of Chemistry , University of Helsinki , POB 55 (A. I. Virtasen aukio 1) , 00014 Helsinki , Finland
Abstract
Abstract
After a compact history of the PT, from Döbereiner’s triads to the theoretical predictions up to element 172, a number of particular issues is discussed: Why may Z = 172 be a limit for stable electron shells? What are the expected stability limits of the nuclear isotopes? When are formally empty atomic orbitals used in molecular electronic structures? What is ‘Secondary Periodicity’? When do the elements (Ir, Pt, Au), at the end of a bond, simulate (N, O, I), respectively? Some new suggestions for alternative PTs are commented upon. As a local connection, Johan Gadolin’s 1794 analysis of the Ytterby mineral is mentioned.
Subject
General Chemical Engineering,General Chemistry
Cited by
19 articles.
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