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=== Basic Structure === The modern periodic table contains: * 7 horizontal periods * 18 vertical groups * 118 confirmed elements (as of 2024) * 4 distinct blocks (s, p, d, f) Elements in the same group share similar chemical properties due to their similar outer electron configurations. The table can be presented in various formats, with the most common being the 18-column or "medium-long" form, where the f-block elements (lanthanides and actinides) are shown separately below the main table.
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