Видео с ютуба Elements And Properties
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GCSE Chemistry - Group 1 Elements - Alkali Metals | Properties | Reactivity (2026/27 exams)
Periodic Table of The Real Elements
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Щелочные металлы в воде - Химические элементы: свойства и реакции (1/8)
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The most dangerous elements on the periodic table - Shannon Odell
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How The Periodic Table Organizes the Elements | Chemistry Basics