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An approach to the structure of the periodic system we follow in this chapter is through similarity.

The Periodic Table, Despite its near 150 years, is still a vital scientific construct. In this chapter we explore the meaning of the periodic table and of some of its related terms. 2015) and the announcement of four new chemical elements (Van Noorden 2016). “Interestingly, there is no formal definition of ‘Periodic Table’,” claims Karol (2017) in his chapter of the current volume. In so doing we review seven works addressing the similarity of chemical elements accounting for different number of elements and using different properties, either chemical or physical ones. Two instances of this vitality are the recent formulation of a periodic table of protein complexes (Ahnert et al. ” We claim that if the periodic table were “wrong,” its structure would be variable; however the test of the time, including similarity studies, show that it is rather invariable. 2013, van Brakel 2014, Restrepo & Harré 2015), which is confusing, leading to misconceptions. In so doing we highlight a few common mistakes that arise from confusion of those terms and from misinterpretation of others. The concept of “chemical element” has raised the interest of several scholars such as Paneth (1962) and is still a matter of discussion given the double meaning it has (see, e.g., Scerri 2007, Earley 2009, Ruthenberg 2009, Ghibaudi et al. An approach to the structure of the periodic system we follow in this chapter is through similarity. According to Paneth (1962), a basic substance belongs to the transcendental world and it is devoid of qualities, and therefore is not perceptible to our senses. The two meanings of the concept of chemical element are basic and simple substance. And even worse, the related concepts that come into play when referring to the periodic table (such as periodic law, chemical element, periodic system, and some others) overlap, leading to confusion.