Уроки химии и биологии он-лайн. Учитель: Денис Крылатов. denisest@
denisest@
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![Периодическое изменение свойств химических элементов в ПСХЭ |Таблица Менделеева [Урок 10]](https://sun9-1.userapi.com/fNv27d7GbcIRknpHtMsHZRjutAqBvQ0izzF8Xg/AOWwpvoT6TQ.jpg)
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