How does the periodic table? - Declaration

How does the periodic table?  - Declaration


The periodic table is clearly structured.

The periodic table of elements - the building

  • Before you look at how the periodic table of the elements work, you should clarify the basic structure of the overview. Take this, take a look at the PSE; simple overviews can be found on the Internet and in any textbook.
  • All chemical elements found in nature, in the PSE have a permanent place. The order comprises a vertical arrangement and a horizontal structure.
  • Elements, which are in the same vertical group similar characteristics, such as the ability to react apply. Additionally, a division into major and minor groups, the subgroups in the middle of the PSE have their place.
  • The numbering within the PSE is from left to right and from top to bottom. In addition, nearly all periodic tables contain additional information, such as the molecular weight.

How the System Overview

  • But how comes into the characteristic structure? The characteristic ordering of the elements in the periodic system works on a certain principle.
  • So corresponds to the group number within the PSE to the number of outer electrons, of which the particular element has. Elements of the first main group therefore possess an electron, can be found in the eighth main group of eight outer electrons - in this case the maximum electron population is reached. Elements with eight electrons are also called "noble gases"; all other elements always strive for this condition, which is also called "noble gas configuration".
  • Against this background, this explains, for example, the reactivity of the different elements; as those of the first main group are particularly reactive. Here the tendency is particularly high, to connect with a partner who has seven valence electrons. Both partners together then achieve the desired noble gas configuration. A single electron can leave easily.

So you see: Sorting in PSE is based on clear, comprehensible principles. If you shortly later encounter an element - for example, as "Ion" on the label of a bottle of mineral water - look quietly even know where is the substance in question in the PSE.

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