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首页> 外文期刊>Foundations of chemistry >Does the period table appear doubled? Two variants of division of elements into two subsets. Internal and secondary periodicity
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Does the period table appear doubled? Two variants of division of elements into two subsets. Internal and secondary periodicity

机译：句号表会出现翻了一番吗？ 分为两个子集分为两个子集的两个变体。 内部和次要周期

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摘要

Demarcation of elements for two subsets appears to be the most fundamental approach to their classification. If one draws a vertical straight line through the middle of each block of elements in the Periodic table, all the elements are divided into two subsets: "early" and "later". For example, in the d-block, the early ones are Sc-Mn, and the late ones, respectively, are Fe-Zn. Later elements partially repeat the properties of the early ones, and this is defined as the internal periodicity. Another criterion for dividing the elements into two subsets is the evenness and oddness of the sum of n + l, where n is the principal quantum number, and l is the orbital quantum number for the outer electron subshells. Properties of the odd elements (for example, B-Ne, Ga-Kr, Tl-Rn in the p-block) are closer to each other than to properties of even elements (Al-Ar, In-Xe), and vice versa. This regularity is manifested as the secondary periodicity. The history of concepts, which considered the existence of subsets as well as of inner and secondary periodicities, is discussed. The features of the electronic structure, which underlie the existence of subsets, are considered. The existence of subsets was depicted earlier by dividing the periodic table into two tables or by applying a mirror-symmetric table. Small changes are proposed in the conventional Periodic table, allowing to reflect the existence of the considered subsets.
机译：两个子集的元素划分似乎是他们分类中最基本的方法。如果一个人在周期表中通过每个元素块的中间绘制垂直直线，则所有元素都分为两个子集：“早期”和“稍后”。例如，在D-Block中，早期的是SC-Mn，并且分别是后期的，是Fe-Zn。后来元素部分重复早期的属性，这被定义为内部周期性。将元素分成两个子集的另一标准是N + L和的均匀性和奇数，其中n是主量子数，L是外电子子壳的轨道量子数。奇数元件的性质（例如，P块中的B-NE，GA-KR，TL-RN）彼此靠近甚至元素（AL-AR，XE）的特性，反之亦然。这种规律表现为次要周期。讨论了概念的历史，其认为是子集的存在以及内部和次要周期。考虑了电子结构的特征，其底部存在子集。通过将周期性表划分为两个表或应用镜面对称表来提前地描绘了子集的存在。在传统的周期表中提出了小的变化，允许反映所考虑的子集的存在。

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