![]() Vertically (rows), elements are arranged in 18 groups, with each group ordered based on electron quantity within the atoms of the elements. Horizontally (columns), elements are organized based on the level of their electron ground state energy. Next, we see the elements arranged in periods and groups (columns and rows). The last element, Oganesson, has an atomic number of 118. Hydrogen lands in the first spot because it has only one proton per hydrogen atom. First, each element is arranged in numerical order of its atomic number. The arrangement of the periodic table is very important in our understanding of it. How is the periodic table of the elements arranged? It’s no wonder we see this fascinating table all over the science world!
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