The Position of the Actinides in the Periodic Table; LA UBICACION DE LOS ACTINIDOS EN EL CUADRO PERIODICO
Generalization of the Bohr theory leads to a law of formation of extranuclear electronic configurations which are shown graphically. The table corresponds to a natural classification of the elements which, except for slight variations, are grouped vertically in the same manner as in Mendeleev's periodic table. The elements are arranged horizontally in the order of the energy levels successively occupied by the electrons. Thus, the first period consists of hydrogen, helium, lithium, and beryllium, whose electronic configurations contain electrons in the Ks and Ls levels. Analysis of the law of formation of electronic configurations leads to the conclusion that the lanthanide series consists of lanthanum and the 13 elements following it. The electronic configurations of the series are of the type Nf/sup n/Ps/sup 2/ (n = 1 to 14). The actinide series is made up of actinium and the 13 elements following it. The electronic configurations of the series are of the type Of/sup n/Qs/sup 2/ (n = 1 to 14). It will be necessary to correct the present arrangement of the periodic table by inserting the lanthanide series between barium and lutetium and by placing the actinide series between radium and element 103. The scandium group IIIa should comprise the elements scandium, yttrium, lutetium, and element 103 instead of the present composition of scandium, yttrium, lanthanum, and actinium. (auth)
- Research Organization:
- Univ. of Uruguay, Montevideo
- NSA Number:
- NSA-13-006377
- OSTI ID:
- 4264786
- Report Number(s):
- A/CONF.15/P/1535
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-59
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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