Периодический закон и Периодическая система химических элементов Видеоурок по химии
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![Мозаика Пенроуза, бесконечная и неповторимая [Veritasium]](https://sun9-58.userapi.com/TPZHmhj1SImpzUpZP4M9PLqKR1DXtfLACFX2fA/6ogSKqXkbW8.jpg)
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