1751 - Nickel 1774 - Manganese 1781 - Molybdenum 1782 - Tellurium 1783 - Tungsten 1789 - Uranium 1789 - Zirconium 1791 - Titanium 1794 - Yttrium 1797 - Berylium 1797 - Chromium 1801 - Niobium 1802 - Tantalum 1803 - Iridium, Palladium, Rhodium 1807 - Potassium, Sodium 1808 - Boron, Barium, Calcium, Magnesium, Strontium 1814 - Cerium 1817 - Lithium, Cadmium, Selenium 1823 - Silicon 1827 - Aluminium 1828 - Thorium 1830 - Vanadium 1839 - Lanthanum 1843 - Erbium, Terbium 1844 - Ruthenium 1860 - Cesium, Rubidium 1861 - Thallium 1863 - Indium 1875 - Gallium 1878-1885 - Holmium, Thulium, Scandium, Samarium, Gadalinium, Praseodynium, Neodynium, Dysprosium 1886 - Germanium 1898 - Polonium, Radium 1899 - Actinium 1901 - Europium 1907 - Lutetium 1917 - Protactinium 1923 - Hafnium 1924 - Rhenium 1937 - Technetium 1939 - Francium 1945 - Promethium 1940-61 - Transuranium elements – (Neptunium, Plutonium, Curium, Americum, Berkelium, Californium, Einsteinium, Fermium, Mendelevium, Nobelium, Lawrencium)