In principle God created the elements, the foundation of creation. Starting from hydrogen, placed at the center of the figure, the 18 groups of chemical elements are formed in succession, thus gathered for their particular affinities, as exposed in the Mendeleev table. Those from the 3rd group to Gugo 12 ° are the metal transition elements. Between one element and the next one there is a progressive increase in protons, neutrons and electrons. The atomic number is the proof.
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