![]() The periodic table is also organized by electron configurations and properties. So, the periodic table used today is Henry Moseley's periodic table. The periodic table was first created by Dmitri Mendeleev. That is the basis for creating the modern periodic table that we know today. The basis for creating the periodic table is the atomic number (the number of protons in the atomic nucleus), not the mass number. ![]() What is The Basis for Creating The Periodic Table? The f block is the elements at the bottom of the periodic table (lanthanides and actinides). Block d is all the elements in groups 3-12. The p block is on the right side of the periodic table (groups 13-18), except Helium (s block). The s block is elements in groups 1 and 2. So, blocks are elements that are grouped based on the atomic orbitals of the valence electrons. The blocks are based on atomic orbital spectroscopic lines. In general, the periodic table of elements has four parts blocks s, p, d, and f. The table provides main information about a chemical element symbol and atomic number. The periodic table is a table that presents a list of 118 chemical elements.
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