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Unbiseptium might be notable enough for an article since the discussion at Talk: Wikiproject Elements says that unbiseptium had an unsuccessful synthesis attempt in fusion of natural tantalum (180mTa, 181Ta) and xenon-136. Gcchemistry (talk) 22:10, 10 September 2012 (UTC)[reply]
It's 180mTa, BTW, without an extra superscript for the m. Double sharp (talk) 10:57, 11 September 2012 (UTC)[reply]
And even 184 had a synthesis experiment (238U + 238U(!!!), I think, though I cannot recall details), though I would not add that one. Double sharp (talk) 07:12, 3 May 2013 (UTC)[reply]
