The periodic table of elements is a systematic arrangement of elements by increasing atomic number, grouping them into periods (rows) and groups (columns) based on similar electron configurations and recurring chemical properties, a concept discovered by Dmitri Mendeleev and refined with modern atomic theory to predict element behaviour.
| Atomic Number |
Chemical Symbol |
Element Name |
Year Discovered |
|---|---|---|---|
| 1 | H | Hydrogen | 1776 |
| 2 | He | Helium | 1895 |
| 3 | Li | Lithium | 1817 |
| 4 | Be | Beryllium | 1797 |
| 5 | B | Boron | 1808 |
| 6 | C | Carbon | ancient |
| 7 | N | Nitrogen | 1772 |
| 8 | O | Oxygen | 1774 |
| 9 | F | Fluorine | 1886 |
| 10 | Ne | Neon | 1898 |
| 11 | Na | Sodium | 1807 |
| 12 | Mg | Magnesium | 1755 |
| 13 | Al | Aluminum | 1825 |
| 14 | Si | Silicon | 1824 |
| 15 | P | Phosphorus | 1669 |
| 16 | S | Sulfur | ancient |
| 17 | Cl | Chlorine | 1774 |
| 18 | Ar | Argon | 1894 |
| 19 | K | Potassium | 1807 |
| 20 | Ca | Calcium | 1808 |
| 21 | Sc | Scandium | 1879 |
| 22 | Ti | Titanium | 1791 |
| 23 | V | Vanadium | 1830 |
| 24 | Cr | Chromium | 1797 |
| 25 | Mn | Manganese | 1774 |
| 26 | Fe | Iron | ancient |
| 27 | Co | Cobalt | 1735 |
| 28 | Ni | Nickel | 1751 |
| 29 | Cu | Copper | ancient |
| 30 | Zn | Zinc | ancient |
| 31 | Ga | Gallium | 1875 |
| 32 | Ge | Germanium | 1886 |
| 33 | As | Arsenic | ancient |
| 34 | Se | Selenium | 1817 |
| 35 | Br | Bromine | 1826 |
| 36 | Kr | Krypton | 1898 |
| 37 | Rb | Rubidium | 1861 |
| 38 | Sr | Strontium | 1790 |
| 39 | Y | Yttrium | 1794 |
| 40 | Zr | Zirconium | 1789 |
| 41 | Nb | Niobium | 1801 |
| 42 | Mo | Molybdenum | 1781 |
| 43 | Tc | Technetium | 1937 |
| 44 | Ru | Ruthenium | 1844 |
| 45 | Rh | Rhodium | 1803 |
| 46 | Pd | Palladium | 1803 |
| 47 | Ag | Silver | ancient |
| 48 | Cd | Cadmium | 1817 |
| 49 | In | Indium | 1863 |
| 50 | Sn | Tin | ancient |
| 51 | Sb | Antimony | ancient |
| 52 | Te | Tellurium | 1783 |
| 53 | I | Iodine | 1811 |
| 54 | Xe | Xenon | 1898 |
| 55 | Cs | Cesium | 1860 |
| 56 | Ba | Barium | 1808 |
| 57 | La | Lanthanum | 1839 |
| 58 | Ce | Cerium | 1803 |
| 59 | Pr | Praseodymium | 1885 |
| 60 | Nd | Neodymium | 1885 |
| 61 | Pm | Promethium | 1945 |
| 62 | Sm | Samarium | 1879 |
| 63 | Eu | Europium | 1901 |
| 64 | Gd | Gadolinium | 1880 |
| 65 | Tb | Terbium | 1843 |
| 66 | Dy | Dysprosium | 1886 |
| 67 | Ho | Holmium | 1867 |
| 68 | Er | Erbium | 1842 |
| 69 | Tm | Thulium | 1879 |
| 70 | Yb | Ytterbium | 1878 |
| 71 | Lu | Lutetium | 1907 |
| 72 | Hf | Hafnium | 1923 |
| 73 | Ta | Tantalum | 1802 |
| 74 | W | Tungsten | 1783 |
| 75 | Re | Rhenium | 1925 |
| 76 | Os | Osmium | 1803 |
| 77 | Ir | Iridium | 1803 |
| 78 | Pt | Platinum | 1735 |
| 79 | Au | Gold | ancient |
| 80 | Hg | Mercury | ancient |
| 81 | Tl | Thallium | 1861 |
| 82 | Pb | Lead | ancient |
| 83 | Bi | Bismuth | ancient |
| 84 | Po | Polonium | 1898 |
| 85 | At | Astatine | 1940 |
| 86 | Rn | Radon | 1900 |
| 87 | Fr | Francium | 1939 |
| 88 | Ra | Radium | 1898 |
| 89 | Ac | Actinium | 1899 |
| 90 | Th | Thorium | 1829 |
| 91 | Pa | Protactinium | 1913 |
| 92 | U | Uranium | 1789 |
| 93 | Np | Neptunium | 1940 |
| 94 | Pu | Plutonium | 1940 |
| 95 | Am | Americium | 1944 |
| 96 | Cm | Curium | 1944 |
| 97 | Bk | Berkelium | 1949 |
| 98 | Cf | Californium | 1950 |
| 99 | Es | Einsteinium | 1952 |
| 100 | Fm | Fermium | 1952 |
| 101 | Md | Mendelevium | 1955 |
| 102 | No | Nobelium | 1958 |
| 103 | Lr | Lawrencium | 1961 |
| 104 | Rf | Rutherfordium | 1964 |
| 105 | Db | Dubnium | 1967 |
| 106 | Sg | Seaborgium | 1974 |
| 107 | Bh | Bohrium | 1981 |
| 108 | Hs | Hassium | 1984 |
| 109 | Mt | Meitnerium | 1982 |
