The currently widely used periodic table is a long periodic table that is said to have been modified by Werner (who received the Nobel Prize for chemistry in 1913) in 1905, starting from the short period table devised by Mendelev in 1869 ( The figure below). The fact that this table was invented about 100 years ago is a great feat, but there are also seemingly unreasonable points. Therefore, as it entered into the 21st century, it is this cubic periodic table "element touch" that was dismantled from the conventional periodic method once and made from a new viewpoint.

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For example, ₂₀Ca and ₄₈Cd, Group 4 ₂₂Ti and ₅₀Sn are in seemingly unrelated positions in the long period table. Also, ₇₁Lu at the right end of the table below is very similar to ₃₉Y and ₅₇La, but it is not clear in the long period table. In the element touch, Ca and Cd, Ti and Sn, and Y, La and Lu are now aligned in a row.

The long periodic table is the most complete periodic table, but it is still not perfect. Element Touch is a new periodic table in which elemental symbols are arranged in a spiral, and succeeded in solving the problems of the long periodic table.

This is an element called d-transition metal from Group 3 to Group 12 in the fourth line and below It is unreasonable to have occurred. In the long periodic table, there are many elements that have been exposed in the small table below.

d Electron transition metal elements (such as scandium 21Sc to zinc 30Zn) have d electrons in the outermost shell, and these are incorporated in the center of the periodic table. However, the f-electron system transition metal element j is treated as a separate table below, so there is a discontinuity between barium with atomic number 56 and hafnium with 72. Unlike when the long period table was created, lanthanide elements, which are f-electron transition metals, are now very popular elements in demand, including magnetic materials that support the high-tech industry. It should not be treated. In the element touch, starting with hydrogen of atomic number 1, all elements are arranged in a spiral without breaking in atomic symbol order.

Do you know the phenomenon of superconductivity where current flows without energy loss? In the 21st century, the technology is expected to be expanded for practical use, but the key to holding it is the development of new materials. At that time, it is important to know what kind of elements have similar properties. In fact, new elements can often be found by replacing elements with the same vertical row in the Elemente Touch, although they are quite far away in the conventional long-period table.

For example, a new superconductor was discovered by replacing ₂₀Ca with ₄₈Cd. Both tend to be +2 ions, and groups 2 and 12 to which these elements belong were called groups 2A and 2B before 1985, respectively. What's more, in Mendeleef's short periodic table, these were originally in the same column. This was because the metal element expressed the most stable valence number when forming an oxide. Besides this, Group 4 ₂₂Ti and Group 14 ₅₀Sn, both of which are likely to be +4 nonmagnetic ions, are also seemingly unrelated positions in the long period table.

In addition, lutetium ₇₁Lu with atomic number 71 is similar to ₃₉Y and ₅₇La among the rare earth elements including lanthanides in that it is a trivalent nonmagnetic ion, but it was not clear in the long periodic table.

In response to these problems, elements that are likely to be divalent, trivalent, and tetravalent are now aligned vertically in Elementen Touch. At the same time, the difference between the typical element and the transition metal element is represented by the difference in color. In the example above, Ca and Cd, Ti and Sn, and Y, La and Lu are aligned in a row (Please see below.).