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1 H Hydrogen 1.0080 2 He Helium 4.00260 3 Li Lithium 7.0 4 Be Beryllium 9.012183 5 B Boron 10.81 6 C Carbon 12.011 7 N Nitrogen 14.007 8 O Oxygen 15.999 9 F Fluorine 18.99840316 10 Ne Neon 20.180 11 Na Sodium 22.9897693 12 Mg Magnesium 24.305 13 Al Aluminum 26.981538 14 Si Silicon 28.085 15 P Phosphorus 30.97376200 16 S Sulfur 32.07 17 Cl Chlorine 35.45 18 Ar Argon 39.9 19 K Potassium 39.0983 20 Ca Calcium 40.08 21 Sc Scandium 44.95591 22 Ti Titanium 47.867 23 V Vanadium 50.9415 24 Cr Chromium 51.996 25 Mn Manganese 54.93804 26 Fe Iron 55.84 27 Co Cobalt 58.93319 28 Ni Nickel 58.693 29 Cu Copper 63.55 30 Zn Zinc 65.4 31 Ga Gallium 69.723 32 Ge Germanium 72.63 33 As Arsenic 74.92159 34 Se Selenium 78.97 35 Br Bromine 79.90 36 Kr Krypton 83.80 37 Rb Rubidium 85.468 38 Sr Strontium 87.62 39 Y Yttrium 88.90584 40 Zr Zirconium 91.22 41 Nb Niobium 92.90637 42 Mo Molybdenum 95.95 43 Tc Technetium 96.90636 44 Ru Ruthenium 101.1 45 Rh Rhodium 102.9055 46 Pd Palladium 106.42 47 Ag Silver 107.868 48 Cd Cadmium 112.41 49 In Indium 114.818 50 Sn Tin 118.71 51 Sb Antimony 121.760 52 Te Tellurium 127.6 53 I Iodine 126.9045 54 Xe Xenon 131.29 55 Cs Cesium 132.9054520 56 Ba Barium 137.33 57 La Lanthanum 138.9055 58 Ce Cerium 140.116 59 Pr Praseodymium 140.90766 60 Nd Neodymium 144.24 61 Pm Promethium 144.91276 62 Sm Samarium 150.4 63 Eu Europium 151.964 64 Gd Gadolinium 157.25 65 Tb Terbium 158.92535 66 Dy Dysprosium 162.500 67 Ho Holmium 164.93033 68 Er Erbium 167.26 69 Tm Thulium 168.93422 70 Yb Ytterbium 173.05 71 Lu Lutetium 174.9667 72 Hf Hafnium 178.49 73 Ta Tantalum 180.9479 74 W Tungsten 183.84 75 Re Rhenium 186.207 76 Os Osmium 190.2 77 Ir Iridium 192.22 78 Pt Platinum 195.08 79 Au Gold 196.96657 80 Hg Mercury 200.59 81 Tl Thallium 204.383 82 Pb Lead 207 83 Bi Bismuth 208.98040 84 Po Polonium 208.98243 85 At Astatine 209.98715 86 Rn Radon 222.01758 87 Fr Francium 223.01973 88 Ra Radium 226.02541 89 Ac Actinium 227.02775 90 Th Thorium 232.038 91 Pa Protactinium 231.03588 92 U Uranium 238.0289 93 Np Neptunium 237.048172 94 Pu Plutonium 244.06420 95 Am Americium 243.061380 96 Cm Curium 247.07035 97 Bk Berkelium 247.07031 98 Cf Californium 251.07959 99 Es Einsteinium 252.0830 100 Fm Fermium 257.09511 101 Md Mendelevium 258.09843 102 No Nobelium 259.10100 103 Lr Lawrencium 266.120 104 Rf Rutherfordium 267.122 105 Db Dubnium 268.126 106 Sg Seaborgium 269.128 107 Bh Bohrium 270.133 108 Hs Hassium 269.1336 109 Mt Meitnerium 277.154 110 Ds Darmstadtium 282.166 111 Rg Roentgenium 282.169 112 Cn Copernicium 286.179 113 Nh Nihonium 286.182 114 Fl Flerovium 290.192 115 Mc Moscovium 290.196 116 Lv Livermorium 293.205 117 Ts Tennessine 294.211 118 Og Oganesson 295.216 57–71Lanthanoids 89–103Actinoids
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× Atomic number 1
H Hydrogen
Atomic mass / u 1.0080
Period 1
Classification Nonmetal
Group 1
Electron configuration 1s1 Element data · PubChem ↗