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Text: The periodic table is a systematic arrangement of elements based on their atomic number, electron configurations, and recurring chemical properties. It is divided into groups (columns) and periods (rows). Groups indicate elements with similar properties due to their valence electrons, while periods reflect the number of electron shells. Elements are classified as metals, nonmetals, and metalloids, with distinct characteristics. The table also reveals trends such as electronegativity. Кожен абзац буде тестом.

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