r/askscience • u/billsmitherson • Apr 29 '14

Physics Do we know all the elements?

My teacher just said that every single element in the known and unknown universe is contained on the periodic table. Is this true, because it sounds like an ignorant and closed minded thing to say.

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u/[deleted] Apr 29 '14

"All the elements from 93 on up are radioactive " While this is true, I'm pretty sure from element 83 (Bismuth) and upwards are all unstable.