The rows are called periods A row of elements in the periodic table., and they are numbered from 1 to 7. The elements are arranged in seven horizontal rows, in order of increasing atomic number from left to right and top to bottom. It summarizes huge amounts of information about the elements in a way that permits you to predict many of their properties and chemical reactions. The elements are arranged in a periodic table ( Figure 1.24 "The Periodic Table Showing the Elements in Order of Increasing " also see Chapter 32 "Appendix H: Periodic Table of Elements"), which is probably the single most important learning aid in chemistry.
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