Periodic table of the elements
A list of all 118 elements with atomic number, symbol, standard atomic mass, category and electron configuration. Open the interactive periodic table to explore the layout visually.
Elements
| Z | Symbol | Name | Atomic mass | Category | Electron configuration |
|---|---|---|---|---|---|
| 1 | H | Hydrogen | 1.008 | Reactive nonmetal | 1s1 |
| 2 | He | Helium | 4.0026 | Noble gas | 1s2 |
| 3 | Li | Lithium | 6.94 | Alkali metal | [He] 2s1 |
| 4 | Be | Beryllium | 9.0122 | Alkaline earth | [He] 2s2 |
| 5 | B | Boron | 10.81 | Metalloid | [He] 2s2 2p1 |
| 6 | C | Carbon | 12.011 | Reactive nonmetal | [He] 2s2 2p2 |
| 7 | N | Nitrogen | 14.007 | Reactive nonmetal | [He] 2s2 2p3 |
| 8 | O | Oxygen | 15.999 | Reactive nonmetal | [He] 2s2 2p4 |
| 9 | F | Fluorine | 18.998 | Halogen | [He] 2s2 2p5 |
| 10 | Ne | Neon | 20.18 | Noble gas | [He] 2s2 2p6 |
| 11 | Na | Sodium | 22.99 | Alkali metal | [Ne] 3s1 |
| 12 | Mg | Magnesium | 24.305 | Alkaline earth | [Ne] 3s2 |
| 13 | Al | Aluminium | 26.982 | Post-transition metal | [Ne] 3s2 3p1 |
| 14 | Si | Silicon | 28.085 | Metalloid | [Ne] 3s2 3p2 |
| 15 | P | Phosphorus | 30.974 | Reactive nonmetal | [Ne] 3s2 3p3 |
| 16 | S | Sulfur | 32.06 | Reactive nonmetal | [Ne] 3s2 3p4 |
| 17 | Cl | Chlorine | 35.45 | Halogen | [Ne] 3s2 3p5 |
| 18 | Ar | Argon | 39.948 | Noble gas | [Ne] 3s2 3p6 |
| 19 | K | Potassium | 39.098 | Alkali metal | [Ar] 4s1 |
| 20 | Ca | Calcium | 40.078 | Alkaline earth | [Ar] 4s2 |
| 21 | Sc | Scandium | 44.956 | Transition metal | [Ar] 3d1 4s2 |
| 22 | Ti | Titanium | 47.867 | Transition metal | [Ar] 3d2 4s2 |
| 23 | V | Vanadium | 50.942 | Transition metal | [Ar] 3d3 4s2 |
| 24 | Cr | Chromium | 51.996 | Transition metal | [Ar] 3d5 4s1 |
| 25 | Mn | Manganese | 54.938 | Transition metal | [Ar] 3d5 4s2 |
| 26 | Fe | Iron | 55.845 | Transition metal | [Ar] 3d6 4s2 |
| 27 | Co | Cobalt | 58.933 | Transition metal | [Ar] 3d7 4s2 |
| 28 | Ni | Nickel | 58.693 | Transition metal | [Ar] 3d8 4s2 |
| 29 | Cu | Copper | 63.546 | Transition metal | [Ar] 3d10 4s1 |
| 30 | Zn | Zinc | 65.38 | Transition metal | [Ar] 3d10 4s2 |
| 31 | Ga | Gallium | 69.723 | Post-transition metal | [Ar] 3d10 4s2 4p1 |
| 32 | Ge | Germanium | 72.63 | Metalloid | [Ar] 3d10 4s2 4p2 |
| 33 | As | Arsenic | 74.922 | Metalloid | [Ar] 3d10 4s2 4p3 |
| 34 | Se | Selenium | 78.971 | Reactive nonmetal | [Ar] 3d10 4s2 4p4 |
| 35 | Br | Bromine | 79.904 | Halogen | [Ar] 3d10 4s2 4p5 |
| 36 | Kr | Krypton | 83.798 | Noble gas | [Ar] 3d10 4s2 4p6 |
| 37 | Rb | Rubidium | 85.468 | Alkali metal | [Kr] 5s1 |
| 38 | Sr | Strontium | 87.62 | Alkaline earth | [Kr] 5s2 |
| 39 | Y | Yttrium | 88.906 | Transition metal | [Kr] 4d1 5s2 |
| 40 | Zr | Zirconium | 91.224 | Transition metal | [Kr] 4d2 5s2 |
| 41 | Nb | Niobium | 92.906 | Transition metal | [Kr] 4d4 5s1 |
| 42 | Mo | Molybdenum | 95.95 | Transition metal | [Kr] 4d5 5s1 |
| 43 | Tc | Technetium | 98 | Transition metal | [Kr] 4d5 5s2 |
| 44 | Ru | Ruthenium | 101.07 | Transition metal | [Kr] 4d7 5s1 |
| 45 | Rh | Rhodium | 102.91 | Transition metal | [Kr] 4d8 5s1 |
| 46 | Pd | Palladium | 106.42 | Transition metal | [Kr] 4d10 |
| 47 | Ag | Silver | 107.87 | Transition metal | [Kr] 4d10 5s1 |
| 48 | Cd | Cadmium | 112.41 | Transition metal | [Kr] 4d10 5s2 |
| 49 | In | Indium | 114.82 | Post-transition metal | [Kr] 4d10 5s2 5p1 |
| 50 | Sn | Tin | 118.71 | Post-transition metal | [Kr] 4d10 5s2 5p2 |
| 51 | Sb | Antimony | 121.76 | Metalloid | [Kr] 4d10 5s2 5p3 |
| 52 | Te | Tellurium | 127.6 | Metalloid | [Kr] 4d10 5s2 5p4 |
| 53 | I | Iodine | 126.9 | Halogen | [Kr] 4d10 5s2 5p5 |
| 54 | Xe | Xenon | 131.29 | Noble gas | [Kr] 4d10 5s2 5p6 |
| 55 | Cs | Caesium | 132.91 | Alkali metal | [Xe] 6s1 |
| 56 | Ba | Barium | 137.33 | Alkaline earth | [Xe] 6s2 |
| 57 | La | Lanthanum | 138.91 | Lanthanide | [Xe] 5d1 6s2 |
| 58 | Ce | Cerium | 140.12 | Lanthanide | [Xe] 4f1 5d1 6s2 |
| 59 | Pr | Praseodymium | 140.91 | Lanthanide | [Xe] 4f3 6s2 |
| 60 | Nd | Neodymium | 144.24 | Lanthanide | [Xe] 4f4 6s2 |
| 61 | Pm | Promethium | 145 | Lanthanide | [Xe] 4f5 6s2 |
| 62 | Sm | Samarium | 150.36 | Lanthanide | [Xe] 4f6 6s2 |
| 63 | Eu | Europium | 151.96 | Lanthanide | [Xe] 4f7 6s2 |
| 64 | Gd | Gadolinium | 157.25 | Lanthanide | [Xe] 4f7 5d1 6s2 |
| 65 | Tb | Terbium | 158.93 | Lanthanide | [Xe] 4f9 6s2 |
| 66 | Dy | Dysprosium | 162.5 | Lanthanide | [Xe] 4f10 6s2 |
| 67 | Ho | Holmium | 164.93 | Lanthanide | [Xe] 4f11 6s2 |
| 68 | Er | Erbium | 167.26 | Lanthanide | [Xe] 4f12 6s2 |
| 69 | Tm | Thulium | 168.93 | Lanthanide | [Xe] 4f13 6s2 |
| 70 | Yb | Ytterbium | 173.05 | Lanthanide | [Xe] 4f14 6s2 |
| 71 | Lu | Lutetium | 174.97 | Lanthanide | [Xe] 4f14 5d1 6s2 |
| 72 | Hf | Hafnium | 178.49 | Transition metal | [Xe] 4f14 5d2 6s2 |
| 73 | Ta | Tantalum | 180.95 | Transition metal | [Xe] 4f14 5d3 6s2 |
| 74 | W | Tungsten | 183.84 | Transition metal | [Xe] 4f14 5d4 6s2 |
| 75 | Re | Rhenium | 186.21 | Transition metal | [Xe] 4f14 5d5 6s2 |
| 76 | Os | Osmium | 190.23 | Transition metal | [Xe] 4f14 5d6 6s2 |
| 77 | Ir | Iridium | 192.22 | Transition metal | [Xe] 4f14 5d7 6s2 |
| 78 | Pt | Platinum | 195.08 | Transition metal | [Xe] 4f14 5d9 6s1 |
| 79 | Au | Gold | 196.97 | Transition metal | [Xe] 4f14 5d10 6s1 |
| 80 | Hg | Mercury | 200.59 | Transition metal | [Xe] 4f14 5d10 6s2 |
| 81 | Tl | Thallium | 204.38 | Post-transition metal | [Xe] 4f14 5d10 6s2 6p1 |
| 82 | Pb | Lead | 207.2 | Post-transition metal | [Xe] 4f14 5d10 6s2 6p2 |
| 83 | Bi | Bismuth | 208.98 | Post-transition metal | [Xe] 4f14 5d10 6s2 6p3 |
| 84 | Po | Polonium | 209 | Post-transition metal | [Xe] 4f14 5d10 6s2 6p4 |
| 85 | At | Astatine | 210 | Halogen | [Xe] 4f14 5d10 6s2 6p5 |
| 86 | Rn | Radon | 222 | Noble gas | [Xe] 4f14 5d10 6s2 6p6 |
| 87 | Fr | Francium | 223 | Alkali metal | [Rn] 7s1 |
| 88 | Ra | Radium | 226 | Alkaline earth | [Rn] 7s2 |
| 89 | Ac | Actinium | 227 | Actinide | [Rn] 6d1 7s2 |
| 90 | Th | Thorium | 232.04 | Actinide | [Rn] 6d2 7s2 |
| 91 | Pa | Protactinium | 231.04 | Actinide | [Rn] 5f2 6d1 7s2 |
| 92 | U | Uranium | 238.03 | Actinide | [Rn] 5f3 6d1 7s2 |
| 93 | Np | Neptunium | 237 | Actinide | [Rn] 5f4 6d1 7s2 |
| 94 | Pu | Plutonium | 244 | Actinide | [Rn] 5f6 7s2 |
| 95 | Am | Americium | 243 | Actinide | [Rn] 5f7 7s2 |
| 96 | Cm | Curium | 247 | Actinide | [Rn] 5f7 6d1 7s2 |
| 97 | Bk | Berkelium | 247 | Actinide | [Rn] 5f9 7s2 |
| 98 | Cf | Californium | 251 | Actinide | [Rn] 5f10 7s2 |
| 99 | Es | Einsteinium | 252 | Actinide | [Rn] 5f11 7s2 |
| 100 | Fm | Fermium | 257 | Actinide | [Rn] 5f12 7s2 |
| 101 | Md | Mendelevium | 258 | Actinide | [Rn] 5f13 7s2 |
| 102 | No | Nobelium | 259 | Actinide | [Rn] 5f14 7s2 |
| 103 | Lr | Lawrencium | 266 | Actinide | [Rn] 5f14 6d1 7s2 |
| 104 | Rf | Rutherfordium | 267 | Transition metal | [Rn] 5f14 6d2 7s2 |
| 105 | Db | Dubnium | 268 | Transition metal | [Rn] 5f14 6d3 7s2 |
| 106 | Sg | Seaborgium | 269 | Transition metal | [Rn] 5f14 6d4 7s2 |
| 107 | Bh | Bohrium | 270 | Transition metal | [Rn] 5f14 6d5 7s2 |
| 108 | Hs | Hassium | 277 | Transition metal | [Rn] 5f14 6d6 7s2 |
| 109 | Mt | Meitnerium | 278 | Transition metal | [Rn] 5f14 6d7 7s2 |
| 110 | Ds | Darmstadtium | 281 | Transition metal | [Rn] 5f14 6d8 7s2 |
| 111 | Rg | Roentgenium | 282 | Transition metal | [Rn] 5f14 6d9 7s2 |
| 112 | Cn | Copernicium | 285 | Transition metal | [Rn] 5f14 6d10 7s2 |
| 113 | Nh | Nihonium | 286 | Post-transition metal | [Rn] 5f14 6d10 7s2 7p1 |
| 114 | Fl | Flerovium | 289 | Post-transition metal | [Rn] 5f14 6d10 7s2 7p2 |
| 115 | Mc | Moscovium | 290 | Post-transition metal | [Rn] 5f14 6d10 7s2 7p3 |
| 116 | Lv | Livermorium | 293 | Post-transition metal | [Rn] 5f14 6d10 7s2 7p4 |
| 117 | Ts | Tennessine | 294 | Halogen | [Rn] 5f14 6d10 7s2 7p5 |
| 118 | Og | Oganesson | 294 | Noble gas | [Rn] 5f14 6d10 7s2 7p6 |
Frequently asked questions about the periodic table
How many elements are on the periodic table?
The periodic table lists 118 elements, from hydrogen (atomic number 1) to oganesson (atomic number 118).
What is the atomic number?
The atomic number is the number of protons in an atom's nucleus. It defines the element and sets its place in the table.
How are elements arranged on the periodic table?
Elements are arranged by increasing atomic number. Elements in the same column (group) share similar chemical properties, because they have the same number of outer electrons.