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There has been no increase in the number of elements, it's just that people discovered ones that were unknown.

The only exception is the use of nuclear reactions (in accelerators, reactors, and bombs) to create technetium, promethium, and the transuranics. But many of these except for extreme transuranics already existed on earth but at such small trace levels they were unknown until long after they had been artificially made and measured.

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