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Periodic Table of the Elements

Periodic Table of the Elements

Double-click on each element or use the index  to learn more about the elements and their properties.


Group 1 Group 2 Group 3 Group 4 Group 5 Group 6 Group 7 Group 8 Group 9 Group 10 Group 11 Group 12 Group 13 Group 14 Group 15 Group 16 Group 17 Group 18
H is the symbol for Hydrogen, found in the group of 'other non-metals.' Hydrogen's atomic number is 1 and its relative atomic mass is 1.00794. He is the symbol for Helium, a 'noble gas.' Helium's atomic number is 2 and its relative atomic mass is 4.00260.
Li is the symbol for Lithium, an 'alkali metal.' Lithium's atomic number is 3 and its relative atomic mass is 6.941. Be is the symbol for Beryllium, an 'alkaline earth metal.' Beryllium's atomic number is 4 and its relative atomic mass is 9.01218. B is the symbol for Boron, found in the group of 'other non-metals.' Boron's atomic number is 5 and its relative atomic mass is 10.811. C is the symbol for Carbon, found in the group of 'other non-metals.' Carbon's atomic number is 6 and its relative atomic mass is 12.0107. N is the symbol for Nitrogen, found in the group of 'other non-metals.' Nitrogen's atomic number is 7 and its relative atomic mass is 14.0067. O is the symbol for Oxygen, found in the group of 'other non-metals.' Oxygen's atomic number is 8 and its relative atomic mass is 15.9994. F is the symbol for Fluorine, a 'halogen.' Fluorine's atomic number is 9 and its relative atomic mass is 18.9984. Ne is the symbol for Neon, a 'noble gas.' Neon's atomic number is 10 and its relative atomic mass is 20.1797.
Na is the symbol for Sodium, an 'alkali metal.' Sodium's atomic number is 11 and its relative atomic mass is 22.9898. Mg is the symbol for Magnesium, an 'alkaline earth metal.' Magnesium's atomic number is 12 and its relative atomic mass is 24.305. Al is the symbol for Aluminum, found in the group of 'other metals.' Aluminum's atomic number is 13 and its relative atomic mass is 26.9815. Si is the symbol for Silicon, found in the group of 'other non-metals.' Silicon's atomic number is 14 and its relative atomic mass is 28.0855. P is the symbol for Phosphorus, found in the group of 'other non-metals.' Phosphorus' atomic number is 15 and its relative atomic mass is 30.9738. S is the symbol for Sulfur, found in the group of 'other non-metals.' Sulfur's atomic number is 16 and its relative atomic mass is 32.065. Cl is the symbol for Chlorine, a 'halogen.' Chlorine's atomic number is 17 and its relative atomic mass is 35.453. Ar is the symbol for Argon, a 'noble gas.' Argon's atomic number is 18 and its relative atomic mass is 39.948.
K is the symbol for Potassium, an 'alkali metal.' Potassium's atomic number is 19 and its relative atomic mass is 39.0983. Ca is the symbol for Calcium, an 'alkaline earth metal.' Calcium's atomic number is 20 and its relative atomic mass is 40.078. Sc is the symbol for Scandium, a 'transition metal.' Scandium's atomic number is 21 and its relative atomic mass is 44.9559. Ti is the symbol for Titanium, a 'transition metal.' Titanium's atomic number is 22 and its relative atomic mass is 47.867. V is the symbol for Vanadium, a 'transition metal.' Vanadium's atomic number is 23 and its relative atomic mass is 50.9415. Cr is the symbol for Chromium, a 'transition metal.' Chromium's atomic number is 24 and its relative atomic mass is 51.9961. Mn is the symbol for Manganese, a 'transition metal.' Manganese's atomic number is 25 and its relative atomic mass is 54.938. Fe is the symbol for Iron, a 'transition metal.' Iron's atomic number is 26 and its relative atomic mass is 55.845. Co is the symbol for Cobalt, a 'transition metal.' Cobalt's atomic number is 27 and its relative atomic mass is 58.9332. Ni is the symbol for Nickel, a 'transition metal.' Nickel's atomic number is 28 and its relative atomic mass is 58.6934. Cu is the symbol for Copper, a 'transition metal.' Copper's atomic number is 29 and its relative atomic mass is 63.546. Zn is the symbol for Zinc, found in the group of 'other metals.' Zinc's atomic number is 30 and its relative atomic mass is 65.409. Ga is the symbol for Gallium, found in the group of 'other metals.' Gallium's atomic number is 31 and its relative atomic mass is 69.723. Ge is the symbol for Germanium, found in the group of 'other metals.' Germanium's atomic number is 32 and its relative atomic mass is 72.64. As is the symbol for Arsenic, found in the group of 'other non-metals.' Arsenic's atomic number is 33 and its relative atomic mass is 74.9216. Se is the symbol for Selenium, found in the group of 'other non-metals.' Selenium's atomic number is 34 and its relative atomic mass is 78.96. Br is the symbol for Bromine, a 'halogen.' Bromine's atomic number is 35 and its relative atomic mass is 79.904. Kr is the symbol for Krypton, a 'noble gas.' Krypton's atomic number is 36 and its relative atomic mass is 83.798.
Rb is the symbol for Rubidium, an 'alkali metal.' Rubidium's atomic number is 37 and its relative atomic mass is 85.4678. Sr is the symbol for Strontium, an 'alkaline earth metal.' Strontium's atomic number is 38 and its relative atomic mass is 87.62. Y is the symbol for Yttrium, a 'transition metal.' Yttrium's atomic number is 39 and its relative atomic mass is 88.9059. Zr is the symbol for Zirconium, a 'transition metal.' Zirconium's atomic number is 40 and its relative atomic mass is 91.224. Nb is the symbol for Niobium, a 'transition metal.' Niobium's atomic number is 41 and its relative atomic mass is 92.9064. Mo is the symbol for Molybdenum, a 'transition metal.' Molybdenum's atomic number is 42 and its relative atomic mass is 95.94. Tc is the symbol for Technetium, a 'transition metal.' Technetium's atomic number is 43 and its relative atomic mass is [98]. This element has no stable nuclides. Ru is the symbol for Ruthenium, a 'transition metal.' Ruthenium's atomic number is 44 and its relative atomic mass is 101.07. Rh is the symbol for Rhodium, a 'transition metal.' Rhodium's atomic number is 45 and its relative atomic mass is 102.9055. Pd is the symbol for Palladium, a 'transition metal.' Palladium's atomic number is 46 and its relative atomic mass is 106.42. Ag is the symbol for Silver, a 'transition metal.' Silver's atomic number is 47 and its relative atomic mass is 107.8682. Cd is the symbol for Cadmium, found in the group of 'other metals.' Cadmium's atomic number is 48 and its relative atomic mass is 112.411. In is the symbol for Indium, found in the group of 'other metals.' Indium's atomic number is 49 and its relative atomic mass is 114.818. Sn is the symbol for Tin, found in the group of 'other metals.' Tin's atomic number is 50 and its relative atomic mass is 118.710. Sb is the symbol for Antimony, found in the group of 'other metals.' Antimony's atomic number is 51 and its relative atomic mass is 121.760. Te is the symbol for Tellurium, found in the group of 'other non-metals.' Tellurium's atomic number is 52 and its relative atomic mass is 127.60. I is the symbol for Iodine, a 'halogen.' Iodine's atomic number is 53 and its relative atomic mass is 126.9045. Xe is the symbol for Xenon, a 'noble gas.' Xenon's atomic number is 54 and its relative atomic mass is 131.293.
Cs is the symbol for Cesium, an 'alkali metal.' Cesium's atomic number is 55 and its relative atomic mass is 132.90545. Ba is the symbol for Barium, an 'alkaline earth metal.' Barium's atomic number is 56 and its relative atomic mass is 137.327. La-Lu is the symbol for 15 elements known collectively as 'Lanthanides,' found in the lower section of the Table. Hf is the symbol for Hafnium, a 'transition metal.' Helium 's atomic number is 72 and its relative atomic mass is 178.49. Ta is the symbol for Tantalum, a 'transition metal.' Tantalum's atomic number is 73 and its relative atomic mass is 180.9479. W is the symbol for Tungsten, a 'transition metal.' Tungsten's atomic number is 74 and its relative atomic mass is 183.84. Re is the symbol for Rhenium, a 'transition metal.' Rhenium's atomic number is 75 and its relative atomic mass is 186.207. Os is the symbol for Osmium, a 'transition metal.' Osmium's atomic number is 76 and its relative atomic mass is 190.23. Ir is the symbol for Iridium, a 'transition metal.' Iridium's atomic number is 77 and its relative atomic mass is 192.217. Pt is the symbol for Platinum, a 'transition metal.' Platinum's atomic number is 78 and its relative atomic mass is 195.078. Au is the symbol for Gold, a 'transition metal.' Gold's atomic number is 79 and its relative atomic mass is 196.96655. Hg is the symbol for Mercury, found in the group of 'other metals.' Mercury's atomic number is 80 and its relative atomic mass is 200.59. Tl is the symbol for Thallium, found in the group of 'other metals.' Thallium's atomic number is 81 and its relative atomic mass is 204.383. Pb is the symbol for Lead, found in the group of 'other metals.' Lead's atomic number is 82 and its relative atomic mass is 207.2. Bi is the symbol for Bismuth, found in the group of 'other metals.' Bismuth's atomic number is 83 and its relative atomic mass is 208.9804. Po is the symbol for Polonium, found in the group of 'other metals.' Polonium's atomic number is 84 and its relative atomic mass is [209]. This element has no stable nuclides. At is the symbol for Astatine, a 'halogen.' Astatine's atomic number is 85 and its relative atomic mass is [210]. This element has no stable nuclides. Rn is the symbol for Radon, a 'noble gas.' Radon's atomic number is 86 and its relative atomic mass is [222]. This element has no stable nuclides.
Fr is the symbol for Francium, an 'alkali metal.' Francium's atomic number is 87 and its relative atomic mass is [223]. This element has no stable nuclides. Ra is the symbol for Radium, an 'alkaline earth metal.' Radium's atomic number is 88 and its relative atomic mass is [226]. This element has no stable nuclides. Ac-Lr is the symbol for 15 elements known collectively as 'Actinides.' Rf is the symbol for Rutherfordium, a 'transition metal.' Rutherfordium's atomic number is 104 and its relative atomic mass is [261]. This element has no stable nuclides. Db is the symbol for Dubnium, a 'transition metal.' Dubnium's atomic number is 105 and its relative atomic mass is [262]. This element has no stable nuclides. Sg is the symbol for Seaborgium, a 'transition metal.' Seaborgium's atomic number is 106 and its relative atomic mass is [266]. This element has no stable nuclides. Bh is the symbol for Bohrium, a 'transition metal.' Bohrium's atomic number is 107 and its relative atomic mass is [264]. This element has no stable nuclides. Hs is the symbol for Hassium, a 'transition metal.' Hassium's atomic number is 108 and its relative atomic mass is [277]. This element has no stable nuclides. Mt is the symbol for Meitnerium, a 'transition metal.' Meitnerium's atomic number is 109 and its relative atomic mass is (268). This element has no stable nuclides. Ds is the symbol for darmstadtium, a "transition metal." darmstadtium's atomic number is 110 and its relative atomic mass is [281]. Uuu is the symbol for Unununium, a 'transition metal.' Unununium's atomic number is 111 and its relative atomic mass is (272). This element has no stable nuclides. Uub is the symbol for Ununbium, found in the group of 'other metals.' Ununbium's atomic number is 112 and its relative atomic mass is (285). This element has no stable nuclides.   Uuq is the symbol for Ununquadium, found in the group of 'other metals.' Ununquadium's atomic number is 114 and its relative atomic mass is (289). This element has no stable nuclides.    
                             
La is the symbol for Lanthanum, a 'Lanthanide.' Lanthanum's atomic number is 57 and its relative atomic mass is 138.9055. Ce is the symbol for Cerium, a 'Lanthanide.' Cerium's atomic number is 58 and its relative atomic mass is 140.116. Pr is the symbol for Praseodymium, a 'Lanthanide.' Helium 's atomic number is 59 and its relative atomic mass is 140.9077. Nd is the symbol for Neodymium, a 'Lanthanide.' Neodymium's atomic number is 60 and its relative atomic mass is 144.24. Pm is the symbol for Promethium, a 'Lanthanide.' Promethium's atomic number is 61 and its relative atomic mass is [145]. This element has no stable nuclides. Sm is the symbol for Samarium, a 'Lanthanide.' Samarium's atomic number is 62 and its relative atomic mass is 150.36. Eu is the symbol for Europium, a 'Lanthanide.' Europium's atomic number is 63 and its relative atomic mass is 151.964. Gd is the symbol for Gadolinium, a 'Lanthanide.' Gadolinium's atomic number is 64 and its relative atomic mass is 157.25. Tb is the symbol for Terbium, a 'Lanthanide.' Terbium's atomic number is 65 and its relative atomic mass is 158.9253. Dy is the symbol for Dysprosium, a 'Lanthanide.' Dysprosium's atomic number is 66 and its relative atomic mass is 162.50. Ho is the symbol for Holmium, a 'Lanthanide.' Holmium's atomic number is 67 and its relative atomic mass is 164.9303. Er is the symbol for Erbium, a 'Lanthanide.' Erbium's atomic number is 68 and its relative atomic mass is 167.259. Tm is the symbol for Thulium, a 'Lanthanide.' Thulium's atomic number is 69 and its relative atomic mass is 168.9342. Yb is the symbol for Ytterbium, a 'Lanthanide.' Ytterbium's atomic number is 70 and its relative atomic mass is 173.04. Lu is the symbol for Lutetium, a 'Lanthanide.' Lutetium's atomic number is 71 and its relative atomic mass is 174.967.
Ac is the symbol for Actinium, an 'Actinide.' Actinium's atomic number is 89 and its relative atomic mass is [227]. This element has no stable nuclides. Th is the symbol for Thorium, an 'Actinide.' Thorium's atomic number is 90 and its relative atomic mass is 232.0381. This element has no stable nuclides. Pa is the symbol for Protactinium, an 'Actinide.' Protactinium's atomic number is 91 and its relative atomic mass is 231.0359. This element has no stable nuclides. U is the symbol for Uranium, an 'Actinide.' Uranium's atomic number is 92 and its relative atomic mass is 238.0289. This element has no stable nuclides. Np is the symbol for Neptunium, an 'Actinide.' Neptunium's atomic number is 93 and its relative atomic mass is [237]. This element has no stable nuclides. Pu is the symbol for Plutonium, an 'Actinide.' Plutonium's atomic number is 94 and its relative atomic mass is [244]. This element has no stable nuclides. Am is the symbol for Americium, an 'Actinide.' Americium's atomic number is 95 and its relative atomic mass is [243]. This element has no stable nuclides. Cm is the symbol for Curium, an 'Actinide.' Curium's atomic number is 96 and its relative atomic mass is [247]. This element has no stable nuclides. Bk is the symbol for Berkelium, an 'Actinide.' Berkelium's atomic number is 97 and its relative atomic mass is [247]. This element has no stable nuclides. Cf is the symbol for Californium, an 'Actinide.' Californium's atomic number is 98 and its relative atomic mass is [251]. This element has no stable nuclides. Es is the symbol for Einsteinium, an 'Actinide.' Einsteinium's atomic number is 99 and its relative atomic mass is [252]. This element has no stable nuclides. Fm is the symbol for Fermium, an 'Actinide.' Fermium's atomic number is 100 and its relative atomic mass is [257]. This element has no stable nuclides. Md is the symbol for Mendelevium, an 'Actinide.' Mendelevium's atomic number is 101 and its relative atomic mass is [258]. This element has no stable nuclides. No is the symbol for Nobelium, an 'Actinide.' Nobelium's atomic number is 102 and its relative atomic mass is [259]. This element has no stable nuclides. Lr is the symbol for Lawrencium, an 'Actinide.' Lawrencium's atomic number is 103 and its relative atomic mass is [262]. This element has no stable nuclides.
  Colour Legend:    
Orange represents alkali metals Water green represents other metals Medium green represents noble gases
  Dark teal represents alkaline earth metals Brown represents other non-metals Peach represents lanthanides
  Purple represents transition metals Yellow represents halogens Aqua represents actinides
  Symbol in white: element has no stable nuclides  

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Date Modified: 2006-11-29
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