When Were Elements Discovered?

More than 14 chemical elements have been discovered in my lifetime. That's more than were discovered in the entire history of humanity through the year 1734 CE. The Standard Model of Particle Physics was also developed in my lifetime.

Ancient

Copper 9000 BCE - Older than agriculture
Lead 7000 BCE
Gold 6000 BCE
Iron 5000 BCE
Silver 5000 BCE
Carbon 3750 BCE
Tin 3500 BCE
Sulfur 2000 BCE - Drought leads to massive spread of Indo-Europeans
Mercury 1500 BCE
Zinc 1000 BCE - After Bronze Age collapse

Pre-Modern

Antimony 815 CE
Arsenic 815 CE
Bismuth 1000 CE - Lief Erikson reaches North America

Early Modern and Early Industrial Revolution

Phosphorous 1669 CE
Cobalt 1735 CE
Platinum 1735 CE
Nickel 1751 CE
Magnesium 1755 CE
Hydrogen 1766 CE
Oxygen 1771 CE
Nitrogen 1772 CE
Barium 1772 CE
Chlorine 1774 CE
Manganese 1774 CE
Molybdenum 1782 CE
Tellurium 1782 CE
Tungsten 1783 CE
Strontium 1787 CE
Uranium 1789 CE - U.S. Constitution adopted; French Revolution
Zirconium 1789 CE
Titanium 1791 CE - U.S. Bill Of Rights adopted.
Yttrium 1794 CE - First element named after Ytterby, Sweden
Chromium 1794 CE
Beryllium 1798 CE

19th Century

Niobium 1801 CE
Vanadium 1801 CE
Palladium 1802 CE
Tantalum 1802 CE
Iridium 1803 CE
Osmium 1803 CE
Cerium 1803 CE
Rhodium 1804 CE
Potassium 1807 CE
Sodium 1807 CE
Calcium 1808 CE
Boron 1808 CE
Fluorine 1810 CE
Iodine 1811 CE
Selenium 1817 CE
Cadmium 1817 CE
Lithium 1817 CE
Silicon 1818 CE
Aluminum 1824 CE - a.k.a. Aluminium
Bromine 1825 CE
Thorium 1829 CE
Lanthanum 1838 CE
Terbium 1843 CE
Erbium 1843 CE - Second element named after Ytterby
Ruthenium 1844 CE
Cesium 1860 CE
Thallium 1861 CE - U.S. Civil War starts
Rubidium 1861 CE
Indium 1863 CE
Helium 1868 CE - 14th Amendment to U.S. Constitution adopted
Holmium 1878 CE
Ytterbium 1878 CE - Third element named after Ytterby
Samarium 1879 CE
Thulium 1879 CE
Scandium 1879 CE
Gadolinium 1880 CE
Neodymium 1885 CE
Praseodymium 1885 CE
Dysprosium 1886 CE
Germanium 1886 CE
Argon 1894 CE
Europium 1896 CE
Neon 1898 CE
Xenon 1898 CE
Krypton 1898 CE
Radium 1898 CE
Polonium 1898 CE
Radon 1899 CE

20th Century

Actinium 1901 CE
Lutetium 1906 CE
Protactinium 1913 CE
Hafnium 1922 CE
Rhenium 1925 CE
Technetium 1937 CE - First artificially produced element
Francium 1939 CE - World War II begins
Neptunium 1940 CE
Astatine 1940 CE
Plutonium 1940 CE
Curium 1944 CE
Americium 1944 CE
Promethium 1945 CE - World War II ends
Berkelium 1949 CE
Californium 1950 CE
Fermium 1952 CE
Einsteinium 1952 CE
Mendelevium 1955 CE
Lawrencium 1961 CE
Nobelium 1966 CE
Rutherfordium 1969 CE
Dubnium 1970 CE - I am born
Seaborgium 1974 CE
Bohrium 1981 CE
Meitnerium 1982 CE
Hassium 1984 CE
Roentgenium 1994 CE - I get married
Darmstadtium 1994 CE
Copernicium 1996 CE
Flerovium 1998 CE
Livermorium 2000 CE

21st Century

Oganesson 2002 CE
Moscovium 2003 CE
Nihonium 2003 CE
Tennessine 2009 CE

(Source)