Скачать или смотреть The periodic table | Atoms, elements, and the periodic table | High school chemistry | Khan Academy

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The periodic table organizes elements into groups and periods based on their chemical and physical properties. Elements in the same group share similar characteristics, like reactivity. The table is divided into metals, nonmetals, and metalloids, each with distinct properties. Key groups include alkali metals, alkaline earth metals, halogens, and noble gases.

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