The Periodic Table is a systematically arranged chart of elements based on their atomic number, electronic configuration, and chemical properties. Periodicity refers to the repeating trends in element properties, such as atomic size, ionization energy, and electronegativity, observed at regular intervals. These trends arise due to variations in valence electrons and atomic structure.
| Historical Development: Mendeleev to Modern | Groups, Periods, and Classification of Elements |
| Atomic Radius, Ionization Energy, Electronegativity, Electron Affinity |
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