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Periodic TableThe periodic table is a tabular arrangement of the chemicalelements, organized on the basis of their atomic numbers (numbersof protons in the nucleus), electron configurations, and recurringchemical properties. Elements are presented in order of increasingatomic number, which is typically listed with the chemical symbolin each box. The standard form of the table consists of a grid ofelements laid out in 18 columns and 7 rows, with a double row ofelements below that. The table can also be deconstructed into fourrectangular blocks: the s-block to the left, the p-block to theright, the d-block in the middle, and the f-block below that.