The periodic table of elements is one of the most iconic and enduring symbols of modern science. It has been used to classify and understand the physical world since it was first developed in the 19th century, and continues to be essential to our understanding of the building blocks of matter. Over the years, the periodic table has undergone many changes, with new elements being discovered and old ones reclassified. However, the most significant change has been the way in which the elements are arranged.
In the modern version of the periodic table, the elements are arranged in order of increasing atomic number, rather than by their chemical properties, as was the case in earlier versions. This means that each element is assigned a number based on its number of protons, and elements placed adjacent to one another have consecutive atomic numbers. This arrangement has made it easier to predict the properties of elements, allowing scientists to increase their understanding of the physical world.
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