1. Introduction and basic guide

What is the periodic table?

The periodic table is a list or arrangement of all known chemical elements. These are organized in a way that it allows grouping elements with similar atomic structure, and therefore, similar properties. The main criteria for this order is the arrangement by increasing atomic number, which is the number of particles of that element’s nucleus (protons and neutrons). It’s invention is attributed to the Russian chemist Dimitri Mendeleev, and in 2019 we celebrate the 150 anniversary of his original report in 1869.

the periodic table of the elements
Simple periodic table.

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