Блок 1. Теория 2. Видео 1. Валентность и степень окисления
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![Люди, мертвые внутри #109 [RUS VO]](https://sun9-69.userapi.com/qWeTeDu9i4TLMLm_gs2HreBCHSIU6ZOm2mxuLQ/y2KcmcW0Vg0.jpg)
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