Сборник заданий «Нейропрописи».mp4
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![[Chemforall] Какие свойства уменьшаются у элементов третьего периода по мере увеличения порядкового номера?](https://sun9-51.userapi.com/impg/fNfIMmTxBx-XCsLwcA2I9dMzy_N4TakTSo4lyQ/nRioe5NeU4g.jpg?size=320x240&quality=95&keep_aspect_ratio=1&background=000000&sign=971105b36c3fb8fea42f89f387320b0f&c_uniq_tag=fPpK0EEsFar8PsdpD-hPJQCgH2crva1F025kx1cmUNI&type=video_thumb)
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