Discovery of the Elements By kelseybeyer Dec 8, 1774 Manganese Manganese is discovered Dec 8, 1808 Boron is discovered Boron discovered in 1808 Dec 8, 1898 Neon is discovered Neon Dec 8, 1984 Hassium is discovered Hassium Hs Dec 8, 2004 Ununpentium is discovered Uup
