Talk:Periodic table
Periodic table is an organised chart of all the worlds elements. The thing the indivudual elements have in common is the "number of protons number" or the "Z" number. And they have common Chemical Characteristics. And the Elements are then subdivided into a chart (a periodic table chart) having a number of periods (horizontal groupings) and groups (verticle groups). The Standard periodic table has 7 periods with the relationship of period to group period/group being 1/2 2/8 3/8 4/18 5/18 6/32 7/32 for a total of 118 elements. These periods are then shown in the table in a manner that tends to emphasize their chemical similarities. And the periods have been named and the individual element characteristics described with relation to their position in a family of similar period elements. Likewise The individual elements of the groups are known to have similar chemical properties (like the monatomic (single atom) gases, and elements in the same group are called cogeners of each other. And since the size of at least the nucleus of the atoms is directly related to the number of nucleons it contains, the table should be considered as indicating the properties of the atoms as they are sequentially accumulated into larger size entities. and the process involves the addition of only 1 or 2 nucleons at a time. And finally, there are alternate concept of periodic tables, with different organization of the periods and groups that you should look at, because they might let you better understand the basic relationship of the elements to each other. WFPMWFPM (talk) 20:28, 25 October 2008 (UTC)
=========Alternate Periodic Tables=== Besides the standard Periodic Table shown here there are other Periodic Table format presentations that have have been proposed to to give an organized idea of the relationship of the elements to each other. These are discussed in the article with that name Alternative periodic tables in the more complex part of Wiki and are worth review by persons interested in Chemistry, and/or Atomic subject matters. WFPMWFPM (talk) 22:03, 2 November 2008 (UTC)
The problem of periods boundaries and the content of the first period[change source]
Chemists and physicists attribute to Mendeleev the end of periods on an element of the group of noble gases. Although Mendeleev himself during 1870-1906 always ended the periods on the element of the halogen group. Therefore, the first period according to Mendeleev contains 2 elements: coronium (hypothetical element of the material ether) and hydrogen.
It was not Mendeleev who introduced the end of periods on the element of noble gases into science, but the Swiss chemist Alfred Werner in 1905. Therefore, the first Werner period contains two elements: hydrogen and helium.
The German physician, physicist and chemist Julius Lothar Meyer graduated from the periods on the element of the group of alkaline earth metals. Therefore, the first Meyer period contains four elements: hydrogen, helium, lithium and beryllium. And all periods have no gaps between groups of elements.
And periods 2-6 according to Mendeleev and Werner after the first three (Mendeleev) or two (Werner) elements have empty spaces before the subsequent elements.
