Timeline of elements By Ani d Jan 1, 1755 Magnesium Jan 1, 1766 Hydrogen Jan 1, 1772 Nitrogen Jan 1, 1772 Oxygen Feb 1, 1807 Sodium Jan 1, 1808 Boron Jan 1, 1810 Fluorine Jan 1, 1817 Lithium Jan 1, 1825 Aluminium Jan 1, 1828 Beryllium Jan 1, 1895 Helium Jan 1, 1898 Neon
