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1. The main body of the table is a 18 × 7 grid, with gaps included in to keep elements with similar properties together, such as the halogens and the noble gases.
2. The periodic table is a tabular display of the chemical elements, organised on the basis of their properties.
3. The periodic table accurately predicts the properties of various elements and the relations between properties.
4. The f-block is not included in the main table, but rather is usually floated below, as an inline f-block would make the table impractically wide.
5. Elements are presented in increasing atomic number.
6. These gaps form four distinct rectangular areas or blocks.
7. As a result, it provides a useful framework for analyzing chemical behavior, and is widely used in chemistry and other sciences.