Which was the first element to be produced artificially, filling a gap in the periodic table?
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Technetium, discovered in 1937, was the first element to be synthetically produced. Its name actually comes from the Greek word for "artificial." All of its isotopes are radioactive, which is why it is so rare in nature. Photo: Marco Cardin, Wikimedia Commons, CC BY-SA 4.0.
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Source: Wikipedia (CC BY-SA)
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