Group
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1
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2
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3
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4
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5
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6
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7
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8
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9
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10
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11
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12
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13
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14
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15
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16
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17
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18
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Hydrogen & alkali metals
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Alkaline earth metals
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Triels
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Tetrels
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Pnictogens
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Chalcogens
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Halogens
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Noble gases
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Period
1
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Hydrogen1H1.0080
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Helium2He4.0026
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2
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Lithium3Li6.94
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Beryllium4Be9.0122
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Boron5B10.81
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Carbon6C12.011
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Nitrogen7N14.007
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Oxygen8O15.999
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Fluorine9F18.998
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Neon10Ne20.180
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3
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Sodium11Na22.990
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Magnesium12Mg24.305
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Aluminium13Al26.982
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Silicon14Si28.085
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Phosphorus15P30.974
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Sulfur16S32.06
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Chlorine17Cl35.45
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Argon18Ar39.95
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4
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Potassium19K39.098
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Calcium20Ca40.078
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Scandium21Sc44.956
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Titanium22Ti47.867
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Vanadium23V50.942
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Chromium24Cr51.996
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Manganese25Mn54.938
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Iron26Fe55.845
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Cobalt27Co58.933
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Nickel28Ni58.693
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Copper29Cu63.546
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Zinc30Zn65.38
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Gallium31Ga69.723
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Germanium32Ge72.630
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Arsenic33As74.922
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Selenium34Se78.971
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Bromine35Br79.904
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Krypton36Kr83.798
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5
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Rubidium37Rb85.468
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Strontium38Sr87.62
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Yttrium39Y88.906
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Zirconium40Zr91.224
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Niobium41Nb92.906
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Molybdenum42Mo95.95
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Technetium43Tc[97]
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Ruthenium44Ru101.07
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Rhodium45Rh102.91
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Palladium46Pd106.42
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Silver47Ag107.87
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Cadmium48Cd112.41
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Indium49In114.82
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Tin50Sn118.71
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Antimony51Sb121.76
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Tellurium52Te127.60
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Iodine53I126.90
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Xenon54Xe131.29
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6
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Caesium55Cs132.91
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Barium56Ba137.33
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Lutetium71Lu174.97
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Hafnium72Hf178.49
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Tantalum73Ta180.95
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Tungsten74W183.84
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Rhenium75Re186.21
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Osmium76Os190.23
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Iridium77Ir192.22
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Platinum78Pt195.08
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Gold79Au196.97
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Mercury80Hg200.59
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Thallium81Tl204.38
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Lead82Pb207.2
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Bismuth83Bi208.98
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Polonium84Po[209]
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Astatine85At[210]
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Radon86Rn[222]
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7
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Francium87Fr[223]
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Radium88Ra[226]
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Lawrencium103Lr[266]
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Rutherfordium104Rf[267]
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Dubnium105Db[268]
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Seaborgium106Sg[269]
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Bohrium107Bh[270]
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Hassium108Hs[269]
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Meitnerium109Mt[278]
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Darmstadtium110Ds[281]
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Roentgenium111Rg[282]
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Copernicium112Cn[285]
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Nihonium113Nh[286]
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Flerovium114Fl[289]
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Moscovium115Mc[290]
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Livermorium116Lv[293]
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Tennessine117Ts[294]
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Oganesson118Og[294]
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Lanthanum57La138.91
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Cerium58Ce140.12
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Praseodymium59Pr140.91
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Neodymium60Nd144.24
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Promethium61Pm[145]
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Samarium62Sm150.36
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Europium63Eu151.96
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Gadolinium64Gd157.25
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Terbium65Tb158.93
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Dysprosium66Dy162.50
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Holmium67Ho164.93
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Erbium68Er167.26
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Thulium69Tm168.93
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Ytterbium70Yb173.05
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Actinium89Ac[227]
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Thorium90Th232.04
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Protactinium91Pa231.04
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Uranium92U238.03
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Neptunium93Np[237]
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Plutonium94Pu[244]
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Americium95Am[243]
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Curium96Cm[247]
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Berkelium97Bk[247]
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Californium98Cf[251]
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Einsteinium99Es[252]
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Fermium100Fm[257]
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Mendelevium101Md[258]
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Nobelium102No[259]
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