HHomeBackground Color:He
LiBeBlack White GrayBCNOFNe
NaMgAlSiPSClAr
KCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKr
RbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXe
CsBaLaCePrNdPmSmEuGdTbDyHoErTmYbLuHfTaWReOsIrPtAuHgTlPbBiPoAtRn
FrRaAcThPaUNpPuAmCmBkCfEsFmMdNoLrRfDbSgBhHsMtDsRgCnNhFlMcLvTsOg

Atomic Mass of the elements

Text lists sorted by: Value | Atomic Number | Alphabetical
Plots: Shaded | Ball | Crossed Line | Scatter | Sorted Scatter
Log scale plots: Shaded | Ball | Crossed Line | Scatter | Sorted Scatter
Good for this property: Scatter

Hydrogen1.008 Niobium92.90637 Thallium204.38
Helium4.002602 Molybdenum95.95 Lead207.2
Lithium6.94 Technetium97[note] Bismuth208.9804
Beryllium9.0121831 Ruthenium101.07 Polonium209[note]
Boron10.81 Rhodium102.9055 Astatine210[note]
Carbon12.011 Palladium106.42 Radon222[note]
Nitrogen14.007 Silver107.8682 Francium223[note]
Oxygen15.999 Cadmium112.414 Radium226[note]
Fluorine18.998403163 Indium114.818 Actinium227[note]
Neon20.1797 Tin118.71 Thorium232.0377
Sodium22.98976928 Antimony121.76 Protactinium231.03588[note]
Magnesium24.305 Tellurium127.6 Uranium238.02891
Aluminum26.9815385 Iodine126.90447 Neptunium237[note]
Silicon28.085 Xenon131.293 Plutonium244[note]
Phosphorus30.973761998 Cesium132.90545196 Americium243[note]
Sulfur32.06 Barium137.327 Curium247[note]
Chlorine35.45 Lanthanum138.90547 Berkelium247[note]
Argon39.948 Cerium140.116 Californium251[note]
Potassium39.0983 Praseodymium140.90766 Einsteinium252[note]
Calcium40.078 Neodymium144.242 Fermium257[note]
Scandium44.955908 Promethium145 Mendelevium258[note]
Titanium47.867 Samarium150.36 Nobelium259[note]
Vanadium50.9415 Europium151.964 Lawrencium262[note]
Chromium51.9961 Gadolinium157.25 Rutherfordium267[note]
Manganese54.938044 Terbium158.92535 Dubnium270[note]
Iron55.845 Dysprosium162.5 Seaborgium269[note]
Cobalt58.933194 Holmium164.93033 Bohrium270[note]
Nickel58.6934 Erbium167.259 Hassium270[note]
Copper63.546 Thulium168.93422 Meitnerium278[note]
Zinc65.38 Ytterbium173.045 Darmstadtium281[note]
Gallium69.723 Lutetium174.9668 Roentgenium281[note]
Germanium72.63 Hafnium178.49 Copernicium285[note]
Arsenic74.921595 Tantalum180.94788 Nihonium286[note]
Selenium78.971 Tungsten183.84 Flerovium289[note]
Bromine79.904 Rhenium186.207 Moscovium289[note]
Krypton83.798 Osmium190.23 Livermorium293[note]
Rubidium85.4678 Iridium192.217 Tennessine293[note]
Strontium87.62 Platinum195.084 Oganesson294[note]
Yttrium88.90584 Gold196.966569
Zirconium91.224 Mercury200.592


Notes on the Atomic Mass of particular elements:

Technetium: Atomic mass number given for longest lived isotope.

Polonium: Atomic mass number given for longest lived isotope.

Astatine: Atomic mass number given for longest lived isotope.

Radon: Atomic mass number given for longest lived isotope.

Francium: Atomic mass number given for longest lived isotope.

Radium: Atomic mass number given for longest lived isotope.

Actinium: Atomic mass number given for longest lived isotope.

Protactinium: Atomic mass number given for longest lived isotope.

Neptunium: Atomic mass number given for longest lived isotope.

Plutonium: Atomic mass number given for longest lived isotope.

Americium: Atomic mass number given for longest lived isotope.

Curium: Atomic mass number given for longest lived isotope.

Berkelium: Atomic mass number given for longest lived isotope.

Californium: Atomic mass number given for longest lived isotope.

Einsteinium: Atomic mass number given for longest lived isotope.

Fermium: Atomic mass number given for longest lived isotope.

Mendelevium: Atomic mass number given for longest lived isotope.

Nobelium: Atomic mass number given for longest lived isotope.

Lawrencium: Atomic mass number given for longest lived isotope.

Rutherfordium: Atomic mass number given for longest lived isotope.

Dubnium: Atomic mass number given for longest lived isotope.

Seaborgium: Atomic mass number given for longest lived isotope.

Bohrium: Atomic mass number given for longest lived isotope.

Hassium: Atomic mass number given for longest lived isotope.

Meitnerium: Atomic mass number given for longest lived isotope.

Darmstadtium: Atomic mass number given for longest lived isotope.

Roentgenium: Atomic mass number given for longest lived isotope.

Copernicium: Atomic mass number given for longest lived isotope.

Nihonium: Atomic mass number given for longest lived isotope.

Flerovium: Atomic mass number given for longest lived isotope.

Moscovium: Atomic mass number given for longest lived isotope.

Livermorium: Atomic mass number given for longest lived isotope.

Tennessine: Atomic mass number given for longest lived isotope.

Oganesson: Atomic mass number given for longest lived isotope.

Up to date, curated data provided by Mathematica's ElementData function from Wolfram Research, Inc.

The Elements book Mad Science book Periodic Table Poster  Click here to buy a book, photographic periodic table poster, card deck, or 3D print based on the images you see here!
 
Common Properties
Abundance in Earth's Crust Discovery Year
Abundance in Humans Electrical Conductivity
Abundance in Meteorites Electron Affinity
Abundance in the Ocean Electron Configuration
Abundance in the Sun Electronegativity
Abundance in the Universe Half Life
Atomic Mass Heat of Fusion
Atomic Number Heat of Vaporization
Atomic Radius Ionization Energies
Boiling Point Melting Point
Covalent Radius Specific Heat
Density
 
Other Properties
Adiabatic Index Mohs Hardness
Allotrope Names Molar Magnetic Susceptibility
Alternate Names Molar Volume
Block Neutron Cross Section
Brinell Hardness Neutron Mass Absorption
Bulk Modulus NFPA Label
CAS Number Period
CID Number Phase
Color Poisson Ratio
Critical Pressure Quantum Numbers
Critical Temperature Radioactive
Crystal Structure Refractive Index
Curie Point Resistivity
Decay Mode RTECS Number
DOT Hazard Class Series
DOT Numbers Shear Modulus
Electrical Type Space Group Name
Gas Atomic Multiplicities Space Group Number
Group Speed of Sound
Isotope Abundances Superconducting Point
Isotopes (All Known) Symbol
Isotopes (Stable) Thermal Conductivity
Lattice Angles Thermal Expansion
Lattice Constants Valence
Lifetime Van Der Waals Radius
Liquid Density Vickers Hardness
Magnetic Type Volume Magnetic Susceptibility
Mass Magnetic Susceptibility Young Modulus
Memberships