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Consider either unblocking the single ad banner, donating $1 a month (donor log in), or buying a poster or wallet card, order number 1HHydrogen1.008 Series Write-up Wikipedia Wikipedia State at °C°FK Weight u Energy levels Electronegativity Melting point °C°FK Boiling point °C°FK Electron affinity kJ/moleV Ionization,1st2nd3rd4th5th6th7th8th9th10th11th12th13th14th15th16th17th18th19th20th21st22nd23rd24th25th26th27th28th29th30th kJ/moleV Radius,calculatedempiricalcovalentvan der Waals pm Hardness,BrinellMohsVickers MPa Modulus,bulkshearYoung GPa Density,STPLiquid kg/m³g/cm³ Conductivity,thermalelectric W/mKMS/m Heat,specificvaporizationfusion J/kgKkJ/moleVkJ/moleV Abundance,universesolarmeteorcrustoceanhuman % Discovered Oxidation states Configuration Expanded Energy levels HOAO Count isotopes Write-up Wikipedia Mass u Mass excess MeV Binding energy MeV Abundance % Half-life autoydhminsmsµsnsps Decay mode Decay width MeV Specific activity Bq/g Magnetic moment μɴ Quadrupole moment b Temperature °C °F K Year CE Search for: Atomic number Property values 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15Pnictogens 16Chalcogens 17Halogens 18 C Solid Hg Liquid H Gas Rf Unknown Metals Alkali metals Alkaline earth metals Lanthanoids Actinoids Transition metals Post-transition metals Metalloids Nonmetals Reactive nonmetals Noble gases Color Minimum Zero Maximum Unknown Scale Linear Logarithmic s block p block d block f block 1s 2s 3s 4s 5s 6s 7s 2p 3p 4p 5p 6p 7p 3d 4d 5d 6d 4f 5f α Alpha decay p Proton emission n Neutron emission SF Spontaneous fission β⁻ Beta decay β⁺ Positron emission ϵ Electron capture   Stable ✕ Atomic Symbol Name Weight 1 1 H Hydrogen 1.008 2 He Helium 4.0026 2 3 Li Lithium 6.94 4 Be Beryllium 9.0122 5 B Boron 10.81 6 C Carbon 12.011 7 N Nitrogen 14.007 8 O Oxygen 15.999 9 F Fluorine 18.998 10 Ne Neon 20.180 3 11 Na Sodium 22.990 12 Mg Magnesium 24.305 13 Al Aluminium 26.982 14 Si Silicon 28.085 15 P Phosphorus 30.974 16 S Sulfur 32.06 17 Cl Chlorine 35.45 18 Ar Argon 39.948 4 19 K Potassium 39.098 20 Ca Calcium 40.078 21 Sc Scandium 44.956 22 Ti Titanium 47.867 23 V Vanadium 50.942 24 Cr Chromium 51.996 25 Mn Manganese 54.938 26 Fe Iron 55.845 27 Co Cobalt 58.933 28 Ni Nickel 58.693 29 Cu Copper 63.546 30 Zn Zinc 65.38 31 Ga Gallium 69.723 32 Ge Germanium 72.630 33 As Arsenic 74.922 34 Se Selenium 78.971 35 Br Bromine 79.904 36 Kr Krypton 83.798 5 37 Rb Rubidium 85.468 38 Sr Strontium 87.62 39 Y Yttrium 88.906 40 Zr Zirconium 91.224 41 Nb Niobium 92.906 42 Mo Molybdenum 95.95 43 Tc Technetium (98) 44 Ru Ruthenium 101.07 45 Rh Rhodium 102.91 46 Pd Palladium 106.42 47 Ag Silver 107.87 48 Cd Cadmium 112.41 49 In Indium 114.82 50 Sn Tin 118.71 51 Sb Antimony 121.76 52 Te Tellurium 127.60 53 I Iodine 126.90 54 Xe Xenon 131.29 6 55 Cs Caesium 132.91 56 Ba Barium 137.33 57–71 6 57 La Lanthanum 138.91 58 Ce Cerium 140.12 59 Pr Praseodymium 140.91 60 Nd Neodymium 144.24 61 Pm Promethium (145) 62 Sm Samarium 150.36 63 Eu Europium 151.96 64 Gd Gadolinium 157.25 65 Tb Terbium 158.93 66 Dy Dysprosium 162.50 67 Ho Holmium 164.93 68 Er Erbium 167.26 69 Tm Thulium 168.93 70 Yb Ytterbium 173.05 71 Lu Lutetium 174.97 72 Hf Hafnium 178.49 73 Ta Tantalum 180.95 74 W Tungsten 183.84 75 Re Rhenium 186.21 76 Os Osmium 190.23 77 Ir Iridium 192.22 78 Pt Platinum 195.08 79 Au Gold 196.97 80 Hg Mercury 200.59 81 Tl Thallium 204.38 82 Pb Lead 207.2 83 Bi Bismuth 208.98 84 Po Polonium (209) 85 At Astatine (210) 86 Rn Radon (222) 7 87 Fr Francium (223) 88 Ra Radium (226) 89–103 7 89 Ac Actinium (227) 90 Th Thorium 232.04 91 Pa Protactinium 231.04 92 U Uranium 238.03 93 Np Neptunium (237) 94 Pu Plutonium (244) 95 Am Americium (243) 96 Cm Curium (247) 97 Bk Berkelium (247) 98 Cf Californium (251) 99 Es Einsteinium (252) 100 Fm Fermium (257) 101 Md Mendelevium (258) 102 No Nobelium (259) 103 Lr Lawrencium (266) 104 Rf Rutherfordium (267) 105 Db Dubnium (268) 106 Sg Seaborgium (269) 107 Bh Bohrium (270) 108 Hs Hassium (277) 109 Mt Meitnerium (278) 110 Ds Darmstadtium (281) 111 Rg Roentgenium (282) 112 Cn Copernicium (285) 113 Nh Nihonium (286) 114 Fl Flerovium (289) 115 Mc Moscovium (290) 116 Lv Livermorium (293) 117 Ts Tennessine (294) 118 Og Oganesson (294) For elements with no stable isotopes, the mass number of the isotope with the longest half-life is in parentheses. 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