Sentence:  The metals at preſent amount to 21 ; only 11 of which were known before the year 1730. Their names are gold, ſilver, platinum, mercury, copper, iron, tin, lead, zinc, antimony, biſmuth, arſenic, cobalt, nickel, manganeſe, tungſten, <WSD>molybdenum,</WSD> uranium, tellurium, titanium, chromum. 
Meaning of the word marked with <WSD> tags:  A chemical element ("symbol" Mo) with an atomic number of 42: a silvery metal, not found as a free element, used in steel alloys.