Periodic Table actinide series 1945, arrangement

PERIODIC TABLE SHOWING HEAVY ELEMENTS AS MEMBERS OF AN ACTINIDE SERIES Arrangement by Glenn T. Seaborg, 1945... 

Fig. 2. Periodic table showing heavy elements as members of an actinide series. Arrangement by Seaborg (1945).

Actinide series a group of 14 elements following actinium in the periodic table, in which the 5/orbitals are being filled. (7.11 20.1) Activated complex (transition state) the arrangement of atoms found at the top of the potential energy barrier as a reaction proceeds from reactants to products. (12.6)... 

Periodic table of the elements. While the chemical properties of the lanthanides follow quite uniformly that of lanthanum, such a behavior is found only for the second half of the actinides. The arrangement of the early actinides reflects that these resemble, to a decreasing extent, the elements in groups 4-8. The transactinide elements 104 through 112 form the 6d transition element series and take the positions below Hf through Hg. Elements 113 through 118 are the 7p elements eka-TI through eka-Rn... 

A number of the properties covered in this chapter are also given elsewhere in this volume. In this presentation, the properties of the actinide elements are taken as a whole and attempts are made to compare them with the properties of metallic elements occurring in other parts of the periodic table. The actinide metals are often thought to be exotic, because they tend to have properties that are difficult to explain by simple theoretical approaches that have been useful for simple metals. The properties of the actinide metals do in fact represent a severe test to the theoretical solid-state scientist, as do the other transition-metal series. But, like other metals, they are lustrous and may be malleable they have, among their several crystalline structures, some simple atomic arrangements and they have relatively low electrical resistivities and high thermal conductivities. 

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