fried ▁Wilhelm ▁Os ann ▁( 2 6 ▁October ▁ 1 7 9 6 , ▁We imar ▁– ▁ 1 0 ▁August ▁ 1 8 6 6 , ▁Wür zburg ) ▁was ▁a ▁German ▁chem ist ▁and ▁phys ic ist . ▁He ▁is ▁known ▁for ▁his ▁work ▁on ▁the ▁chem istry ▁of ▁plat in um ▁met als . ▁ ▁He ▁studied ▁natural ▁sciences ▁and ▁became ▁a ▁priv at do zent ▁in ▁physics ▁and ▁chem istry ▁at ▁the ▁University ▁of ▁Er lang en ▁in ▁ 1 8 1 9 . ▁Between ▁ 1 8 2 1 ▁and ▁ 1 8 2 3 , ▁he ▁occupied ▁the ▁same ▁position ▁at ▁the ▁University ▁of ▁J ena . ▁He ▁taught ▁chem istry ▁and ▁medicine ▁at ▁the ▁University ▁of ▁Dor pat ▁( D or pat , ▁Governor ate ▁of ▁Liv onia , ▁Russian ▁Empire ; ▁today ▁T art u , ▁Est onia ) ▁from ▁ 1 8 2 3 ▁to ▁ 1 8 2 8 , ▁from ▁ 1 8 2 8 ▁at ▁the ▁University ▁of ▁Wür zburg . ▁ ▁A ▁collaboration ▁with ▁J ö ns ▁Jakob ▁Ber zel ius ▁nearly ▁led ▁to ▁the ▁discovery ▁of ▁r uth enium ▁in ▁ 1 8 2 8 . ▁They ▁dissol ved ▁plat in um ▁ore ▁from ▁the ▁U ral ▁mountains ▁in ▁aqu a ▁regia ▁and ▁s ift ed ▁through ▁the ▁resid ue . ▁Where ▁Ber zel ius ▁found ▁nothing , ▁Os ann ▁thought ▁he ▁had ▁detected ▁three ▁new ▁met als ▁and ▁named ▁them ▁pl ur an ium ▁( con c aten