In 1766 this English chemist discovered the properties of hydrogen, which he called "inflammable air"
He described hydrogen as inflammable air from metals and... [DOC] [TLE] Joseph Priestley, Discoverer of Oxygen National Historic Chemical ... [PAR] When Joseph Priestley discovered oxygen in 1774, he answered age-old ... it not 
been for a free-thinking English chemist and maverick theologian named Joseph 
... gas he called "dephlogisticated air," to which the great French chemist Antoine 
... produced the highly flammable substance Lavoisier would name hydrogen,... [DOC] [TLE] As Time Goes BY by fake name on Prezi [PAR] He discovered hydrogen, deeming it much lighter than air.