Jan 20, 2020 · Individual atoms always have an atomic number as integers, but an oddity occurs in the atomic mass given in the periodic table, as these come in the form of a decimal. This is because the atomic mass represented in the periodic table is the average atomic mass of all the isotopes. Part IV: “Periodic Trends” The periodic table is called such because many properties are periodic functions of their elements. In this section you will define each of the periodic properties and describe how the properties vary across a row and down a column of the periodic table.
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