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Technetium - The First SYNTHETIC Metal on EARTH!Thoisoi2 - Chemical Experiments!14:36Sep, 2021227K background

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Incredibly rare and radioactive elements ☢Periodic Videos10:58Apr, 2019497.6K background

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Pronouncing Things Incorrectly: Periodic Table EditionChaz Smith05:14Feb, 2021110.5K background

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