Founders of Elements By YVE072 1669 Hennig Brand Discovered Phosphorus 1766 Henry Cavendish Discovered Hydrogen 1774 Antoine-Laurent Lavoisier Recognized the significant of the element oxygen 1774 Joseph Prestley Prepared and established the element Oxygen 1807 Humphry Davy Discovered Potassium 1871 Dmitri Mendeleev Discovered Gallium
