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Періодичній системі - 150

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Періодичній системі - 150

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  1. 28 жовтня 2019 року Ліцейімені Б. Лепкого Круглий стіл з обміну досвіду вчителів хімії «Система, яка впорядкувала світ», присвячений 150-річчю створення Періодичної системи хімічних елементів

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