Гелий и Гексафторид серы :)
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8 years ago 00:01:33 13.9K
9 years ago 00:01:31 242
2 years ago 00:01:18 13.2K
7 years ago 00:04:57 116.4K
![Гелий [Периодическая таблица видео]](https://sun9-29.userapi.com/c840527/v840527972/32130/MWxaq6PTTKY.jpg)
8 years ago 00:00:39 20.4K
14 years ago 00:01:31 677
11 years ago 00:21:56 2.7K
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5 years ago 00:21:54 1.6K
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6 years ago 00:01:01 402
3 years ago 00:00:41 136
10 years ago 00:22:53 17.2K
4 years ago 00:03:37 1.7K
10 years ago 00:00:39 10.1K
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11 years ago 00:00:44 65.5K
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9 years ago 00:00:58 4.6K
10 months ago 00:12:32 824
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10 years ago 00:01:31 54