Mononuclidic Elements with Atomic Number as Clue

Guess all the elements that are mononuclidic, i.e. every atom has the same number of neutrons, so there exists only one isotope. The atomic number is given as a clue.

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Last updated: August 9, 2019

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First submitted	August 8, 2019
Times taken	4
Average score	76.2%
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