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Source: Jul 30, 2009 · the periodic table contains nist's latest critically evaluated data for atomic properties of the elements. There are seven on the periodic table.
A period is a horizontal row; Periodic table, in full periodic table of the elements, in chemistry, the organized array of all the chemical elements in order of increasing atomic number—i.e., the total number of protons in the atomic nucleus. Jul 30, 2009 · the periodic table contains nist's latest critically evaluated data for atomic properties of the elements.
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