The periodic table

November 2, 2021

The periodic table is a graphical tool in which all the elements are represented. They are arranged organized by the increasing order of their atomic numbers, which are those that equal the number of protons. It was created by Dmitri Ivanovich Mendeleev and was first published in 1869.

Why is it called the periodic table?

This table is so named because when a “Period” elapses, that is, a certain number of cells, the elements in it are grouped into a new row. Then, they form columns, that is, families or groups in which elements that have similar chemical properties are located .

On one side, for example, light metals appear on the left, heavy metals in the center and non-metals on the right The atomic and ionic numbers increase, orienting themselves all the way down and to the left. Above and to the right is where electron affinity, ionization energy, and electronegativity grow .

Dimitri Ivanovich Mendeleev and his great contribution to science

The Russian chemist Dmitri Ivanovich Mendeleev, born in Tobolsk in 1834, is especially famous for discovering what was then called the Underlying Pattern and today it is known as the “Periodic Table”. This grouping by valences and atomic weights allows a regularity in the properties of the elements to be observed. It was Dimitri Ivanovich who realized that, apart from that, when the elements were ordered there were 3 spaces that were not occupied.

Totally sure of your idea. Ivanovich, stated that these gaps corresponded to elements that had not yet been discovered. He was even able to forecast each other’s capabilities, based on those in the same group. It was during the next 15 years when he was able to verify it when those elements of which he spoke were discovered, and which also coincided very precisely with what he had predicted. In 1955, the chemical element 101 of the periodic table was named in his honor Mendelevium (MD) .

Periodic table blocks

This table can be divided into blocks that go successively with respect to the way that the electron shells of each of the elements are filled. Each of these blocks is divided based on the orbital in which the final electron theoretically dwells: S, P, D and F. Let’s see which they are in a little more detail:


It is made up of the first two families or groups, alkaline earth metals and alkali metals such as helium or hydrogen.


It is made up of groups 3 to 12, in which the transition metals are .


It is made up of the last 6 groups, ranging from 13 to 18. Among all the elements that compose it, there is a greater presence of metalloids.


It is generally located in the final part of the periodic table . This block has no group numbering and is made up of lanthanides and actinides.

Dr. Loony Davis5
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Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
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