# ChemTable: Interactive Periodic Table of the Elements

> Interactive periodic table of all 118 elements: atomic mass, electron configuration, electronegativity, density and more, with explanations for students. Data from IUPAC CIAAW (atomic weights), NIST (ionization energies), PubChem (US National Institutes of Health, other properties, checked against the CRC Handbook) and Wikidata. Available in 8 languages. Made by Zarinda (https://zarinda.com). Updated 2026-10-25.

Notes for using this data:

- Atomic masses are IUPAC CIAAW abridged standard atomic weights. A value in square brackets, such as [97], is the mass number of the most stable isotope of an element with no standard atomic weight.
- The radius is the single-bond covalent radius (Cordero et al., 2008).
- Estimates and predictions are marked or left out: values for superheavy elements are mostly unknown.
- Group numbers follow IUPAC (1–18). Lanthanum–ytterbium and actinium–nobelium form the f-block; lutetium and lawrencium close the d-block.
- ChemTable's compilation, corrections and texts are published under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/): free to reuse with a link to ChemTable. Values from other sources keep their terms; credit them when you reuse the values:
  - Ionization energies: Kramida, A., Ralchenko, Yu., Reader, J. and NIST ASD Team, NIST Atomic Spectra Database (NIST Standard Reference Database 78), https://doi.org/10.18434/T4W30F (NIST Standard Reference Data, © U.S. Secretary of Commerce on behalf of the United States)
  - Covalent radii: Cordero, B. et al., Covalent radii revisited, Dalton Transactions, 2008, 2832–2838, https://doi.org/10.1039/b801115j (values cited from the article)
  - Electron affinities: Electron affinity (data page), Wikipedia, and the primary literature it cites, https://en.wikipedia.org/wiki/Electron_affinity_(data_page) (Wikipedia text under CC BY-SA 4.0)
  - Standard atomic weights: IUPAC Commission on Isotopic Abundances and Atomic Weights (CIAAW), https://www.ciaaw.org/abridged-atomic-weights.htm (values cited from IUPAC)
  - Other properties: PubChem Periodic Table, National Library of Medicine (NIH), https://pubchem.ncbi.nlm.nih.gov/periodic-table/ (US government work; PubChem may include third-party material)
  - Names, discoverers, Wikipedia links: Wikidata, https://www.wikidata.org/ (CC0)
- Every element page exists in each language: https://chemtable.org/iron (English), https://chemtable.org/ru/iron (Russian), and so on with the prefixes ru, fr, de, it, es, zh, pt.

## Data

- [All elements as JSON](https://chemtable.org/data/elements.json): every property, names in 8 languages, Wikidata IDs and page URLs
- [All elements as CSV](https://chemtable.org/data/elements.csv): one row per element
- [Printable periodic table](https://chemtable.org/print): a preview of every sheet and its PDF, in each language (https://chemtable.org/ru/print and so on)
- [Printable periodic table, PDF](https://chemtable.org/print/en/chemtable-periodic-table-a4-color.pdf): A4, A3, US Letter and Tabloid (`a3`, `letter`, `tabloid` in the file name), colour and black-and-white (`bw`); also large print (`-large-`), main groups (`-main-groups-`), electron configurations and an A1 wall poster. For other languages replace `/en/` with `/ru/`, `/fr/`, `/de/`, `/it/`, `/es/`, `/zh/`, `/pt/`
- [Blank periodic table](https://chemtable.org/blank-periodic-table): worksheets with empty cells, atomic numbers only or symbols only, as A4 and US Letter PDFs
- [Full text of every element](https://chemtable.org/llms-full.txt): all properties in Markdown

## Properties

Each page colours the table by one property and lists every element's value, highest first.

- [Atomic Mass of the Elements](https://chemtable.org/atomic-mass): IUPAC standard atomic weights of 84 elements, for the rest the mass number of the most stable isotope: a list from heaviest to lightest and a coloured table.
- [Electronegativity of the Elements](https://chemtable.org/electronegativity): Pauling electronegativity of every element, as a ranked list and a colour-coded periodic table. Fluorine has the highest value, 3.98.
- [Covalent Radius of the Elements](https://chemtable.org/covalent-radius): Covalent radii of the elements in picometres (Cordero 2008): a list by atom size and a periodic table coloured by radius.
- [Density of the Elements](https://chemtable.org/density): Density of the elements in g/cm³: a list from the densest, osmium and iridium, to the lightest, and a periodic table coloured by density.
- [Melting Point of the Elements](https://chemtable.org/melting-point): Melting points of the elements in °C and K: a list from the highest to the lowest and a periodic table coloured by melting point.
- [Ionization Energy of the Elements](https://chemtable.org/ionization-energy): First ionization energies of the elements in eV from NIST: a ranked list and a periodic table. Highest for helium, lowest for caesium.

## Molar mass

- [Molar mass calculator](https://chemtable.org/molar-mass): Free molar mass calculator: type a formula such as H2SO4, Ca(OH)2 or CuSO4·5H2O to get g/mol, each element’s share and the working. IUPAC atomic weights. A formula can be passed in the address: https://chemtable.org/molar-mass?f=Ca(OH)2
- [Molar mass of water (H2O)](https://chemtable.org/molar-mass/water): 18.015 g/mol
- [Molar mass of carbon dioxide (CO2)](https://chemtable.org/molar-mass/carbon-dioxide): 44.009 g/mol
- [Molar mass of sodium chloride (NaCl)](https://chemtable.org/molar-mass/sodium-chloride): 58.44 g/mol
- [Molar mass of sulfuric acid (H2SO4)](https://chemtable.org/molar-mass/sulfuric-acid): 98.07 g/mol
- [Molar mass of hydrochloric acid (HCl)](https://chemtable.org/molar-mass/hydrochloric-acid): 36.46 g/mol
- [Molar mass of sodium hydroxide (NaOH)](https://chemtable.org/molar-mass/sodium-hydroxide): 39.997 g/mol
- [Molar mass of calcium carbonate (CaCO3)](https://chemtable.org/molar-mass/calcium-carbonate): 100.086 g/mol
- [Molar mass of ammonia (NH3)](https://chemtable.org/molar-mass/ammonia): 17.031 g/mol
- [Molar mass of methane (CH4)](https://chemtable.org/molar-mass/methane): 16.043 g/mol
- [Molar mass of glucose (C6H12O6)](https://chemtable.org/molar-mass/glucose): 180.156 g/mol
- [Molar mass of ethanol (C2H5OH)](https://chemtable.org/molar-mass/ethanol): 46.069 g/mol
- [Molar mass of nitric acid (HNO3)](https://chemtable.org/molar-mass/nitric-acid): 63.012 g/mol

## Elements

- [Hydrogen (H)](https://chemtable.org/hydrogen): element 1, nonmetals, atomic mass 1.0080
- [Helium (He)](https://chemtable.org/helium): element 2, noble gases, atomic mass 4.0026
- [Lithium (Li)](https://chemtable.org/lithium): element 3, alkali metals, atomic mass 6.94
- [Beryllium (Be)](https://chemtable.org/beryllium): element 4, alkaline earth metals, atomic mass 9.0122
- [Boron (B)](https://chemtable.org/boron): element 5, metalloids, atomic mass 10.81
- [Carbon (C)](https://chemtable.org/carbon): element 6, nonmetals, atomic mass 12.011
- [Nitrogen (N)](https://chemtable.org/nitrogen): element 7, nonmetals, atomic mass 14.007
- [Oxygen (O)](https://chemtable.org/oxygen): element 8, nonmetals, atomic mass 15.999
- [Fluorine (F)](https://chemtable.org/fluorine): element 9, halogens, atomic mass 18.998
- [Neon (Ne)](https://chemtable.org/neon): element 10, noble gases, atomic mass 20.180
- [Sodium (Na)](https://chemtable.org/sodium): element 11, alkali metals, atomic mass 22.990
- [Magnesium (Mg)](https://chemtable.org/magnesium): element 12, alkaline earth metals, atomic mass 24.305
- [Aluminium (Al)](https://chemtable.org/aluminium): element 13, post-transition metals, atomic mass 26.982
- [Silicon (Si)](https://chemtable.org/silicon): element 14, metalloids, atomic mass 28.085
- [Phosphorus (P)](https://chemtable.org/phosphorus): element 15, nonmetals, atomic mass 30.974
- [Sulfur (S)](https://chemtable.org/sulfur): element 16, nonmetals, atomic mass 32.06
- [Chlorine (Cl)](https://chemtable.org/chlorine): element 17, halogens, atomic mass 35.45
- [Argon (Ar)](https://chemtable.org/argon): element 18, noble gases, atomic mass 39.95
- [Potassium (K)](https://chemtable.org/potassium): element 19, alkali metals, atomic mass 39.098
- [Calcium (Ca)](https://chemtable.org/calcium): element 20, alkaline earth metals, atomic mass 40.078
- [Scandium (Sc)](https://chemtable.org/scandium): element 21, transition metals, atomic mass 44.956
- [Titanium (Ti)](https://chemtable.org/titanium): element 22, transition metals, atomic mass 47.867
- [Vanadium (V)](https://chemtable.org/vanadium): element 23, transition metals, atomic mass 50.942
- [Chromium (Cr)](https://chemtable.org/chromium): element 24, transition metals, atomic mass 51.996
- [Manganese (Mn)](https://chemtable.org/manganese): element 25, transition metals, atomic mass 54.938
- [Iron (Fe)](https://chemtable.org/iron): element 26, transition metals, atomic mass 55.845
- [Cobalt (Co)](https://chemtable.org/cobalt): element 27, transition metals, atomic mass 58.933
- [Nickel (Ni)](https://chemtable.org/nickel): element 28, transition metals, atomic mass 58.693
- [Copper (Cu)](https://chemtable.org/copper): element 29, transition metals, atomic mass 63.546
- [Zinc (Zn)](https://chemtable.org/zinc): element 30, transition metals, atomic mass 65.38
- [Gallium (Ga)](https://chemtable.org/gallium): element 31, post-transition metals, atomic mass 69.723
- [Germanium (Ge)](https://chemtable.org/germanium): element 32, metalloids, atomic mass 72.630
- [Arsenic (As)](https://chemtable.org/arsenic): element 33, metalloids, atomic mass 74.922
- [Selenium (Se)](https://chemtable.org/selenium): element 34, nonmetals, atomic mass 78.971
- [Bromine (Br)](https://chemtable.org/bromine): element 35, halogens, atomic mass 79.904
- [Krypton (Kr)](https://chemtable.org/krypton): element 36, noble gases, atomic mass 83.798
- [Rubidium (Rb)](https://chemtable.org/rubidium): element 37, alkali metals, atomic mass 85.468
- [Strontium (Sr)](https://chemtable.org/strontium): element 38, alkaline earth metals, atomic mass 87.62
- [Yttrium (Y)](https://chemtable.org/yttrium): element 39, transition metals, atomic mass 88.906
- [Zirconium (Zr)](https://chemtable.org/zirconium): element 40, transition metals, atomic mass 91.222
- [Niobium (Nb)](https://chemtable.org/niobium): element 41, transition metals, atomic mass 92.906
- [Molybdenum (Mo)](https://chemtable.org/molybdenum): element 42, transition metals, atomic mass 95.95
- [Technetium (Tc)](https://chemtable.org/technetium): element 43, transition metals, atomic mass [97]
- [Ruthenium (Ru)](https://chemtable.org/ruthenium): element 44, transition metals, atomic mass 101.07
- [Rhodium (Rh)](https://chemtable.org/rhodium): element 45, transition metals, atomic mass 102.91
- [Palladium (Pd)](https://chemtable.org/palladium): element 46, transition metals, atomic mass 106.42
- [Silver (Ag)](https://chemtable.org/silver): element 47, transition metals, atomic mass 107.87
- [Cadmium (Cd)](https://chemtable.org/cadmium): element 48, transition metals, atomic mass 112.41
- [Indium (In)](https://chemtable.org/indium): element 49, post-transition metals, atomic mass 114.82
- [Tin (Sn)](https://chemtable.org/tin): element 50, post-transition metals, atomic mass 118.71
- [Antimony (Sb)](https://chemtable.org/antimony): element 51, metalloids, atomic mass 121.76
- [Tellurium (Te)](https://chemtable.org/tellurium): element 52, metalloids, atomic mass 127.60
- [Iodine (I)](https://chemtable.org/iodine): element 53, halogens, atomic mass 126.90
- [Xenon (Xe)](https://chemtable.org/xenon): element 54, noble gases, atomic mass 131.29
- [Caesium (Cs)](https://chemtable.org/caesium): element 55, alkali metals, atomic mass 132.91
- [Barium (Ba)](https://chemtable.org/barium): element 56, alkaline earth metals, atomic mass 137.33
- [Lanthanum (La)](https://chemtable.org/lanthanum): element 57, lanthanides, atomic mass 138.91
- [Cerium (Ce)](https://chemtable.org/cerium): element 58, lanthanides, atomic mass 140.12
- [Praseodymium (Pr)](https://chemtable.org/praseodymium): element 59, lanthanides, atomic mass 140.91
- [Neodymium (Nd)](https://chemtable.org/neodymium): element 60, lanthanides, atomic mass 144.24
- [Promethium (Pm)](https://chemtable.org/promethium): element 61, lanthanides, atomic mass [145]
- [Samarium (Sm)](https://chemtable.org/samarium): element 62, lanthanides, atomic mass 150.36
- [Europium (Eu)](https://chemtable.org/europium): element 63, lanthanides, atomic mass 151.96
- [Gadolinium (Gd)](https://chemtable.org/gadolinium): element 64, lanthanides, atomic mass 157.25
- [Terbium (Tb)](https://chemtable.org/terbium): element 65, lanthanides, atomic mass 158.93
- [Dysprosium (Dy)](https://chemtable.org/dysprosium): element 66, lanthanides, atomic mass 162.50
- [Holmium (Ho)](https://chemtable.org/holmium): element 67, lanthanides, atomic mass 164.93
- [Erbium (Er)](https://chemtable.org/erbium): element 68, lanthanides, atomic mass 167.26
- [Thulium (Tm)](https://chemtable.org/thulium): element 69, lanthanides, atomic mass 168.93
- [Ytterbium (Yb)](https://chemtable.org/ytterbium): element 70, lanthanides, atomic mass 173.05
- [Lutetium (Lu)](https://chemtable.org/lutetium): element 71, lanthanides, atomic mass 174.97
- [Hafnium (Hf)](https://chemtable.org/hafnium): element 72, transition metals, atomic mass 178.49
- [Tantalum (Ta)](https://chemtable.org/tantalum): element 73, transition metals, atomic mass 180.95
- [Tungsten (W)](https://chemtable.org/tungsten): element 74, transition metals, atomic mass 183.84
- [Rhenium (Re)](https://chemtable.org/rhenium): element 75, transition metals, atomic mass 186.21
- [Osmium (Os)](https://chemtable.org/osmium): element 76, transition metals, atomic mass 190.23
- [Iridium (Ir)](https://chemtable.org/iridium): element 77, transition metals, atomic mass 192.22
- [Platinum (Pt)](https://chemtable.org/platinum): element 78, transition metals, atomic mass 195.08
- [Gold (Au)](https://chemtable.org/gold): element 79, transition metals, atomic mass 196.97
- [Mercury (Hg)](https://chemtable.org/mercury): element 80, transition metals, atomic mass 200.59
- [Thallium (Tl)](https://chemtable.org/thallium): element 81, post-transition metals, atomic mass 204.38
- [Lead (Pb)](https://chemtable.org/lead): element 82, post-transition metals, atomic mass 207.2
- [Bismuth (Bi)](https://chemtable.org/bismuth): element 83, post-transition metals, atomic mass 208.98
- [Polonium (Po)](https://chemtable.org/polonium): element 84, metalloids, atomic mass [209]
- [Astatine (At)](https://chemtable.org/astatine): element 85, halogens, atomic mass [210]
- [Radon (Rn)](https://chemtable.org/radon): element 86, noble gases, atomic mass [222]
- [Francium (Fr)](https://chemtable.org/francium): element 87, alkali metals, atomic mass [223]
- [Radium (Ra)](https://chemtable.org/radium): element 88, alkaline earth metals, atomic mass [226]
- [Actinium (Ac)](https://chemtable.org/actinium): element 89, actinides, atomic mass [227]
- [Thorium (Th)](https://chemtable.org/thorium): element 90, actinides, atomic mass 232.04
- [Protactinium (Pa)](https://chemtable.org/protactinium): element 91, actinides, atomic mass 231.04
- [Uranium (U)](https://chemtable.org/uranium): element 92, actinides, atomic mass 238.03
- [Neptunium (Np)](https://chemtable.org/neptunium): element 93, actinides, atomic mass [237]
- [Plutonium (Pu)](https://chemtable.org/plutonium): element 94, actinides, atomic mass [244]
- [Americium (Am)](https://chemtable.org/americium): element 95, actinides, atomic mass [243]
- [Curium (Cm)](https://chemtable.org/curium): element 96, actinides, atomic mass [247]
- [Berkelium (Bk)](https://chemtable.org/berkelium): element 97, actinides, atomic mass [247]
- [Californium (Cf)](https://chemtable.org/californium): element 98, actinides, atomic mass [251]
- [Einsteinium (Es)](https://chemtable.org/einsteinium): element 99, actinides, atomic mass [252]
- [Fermium (Fm)](https://chemtable.org/fermium): element 100, actinides, atomic mass [257]
- [Mendelevium (Md)](https://chemtable.org/mendelevium): element 101, actinides, atomic mass [258]
- [Nobelium (No)](https://chemtable.org/nobelium): element 102, actinides, atomic mass [259]
- [Lawrencium (Lr)](https://chemtable.org/lawrencium): element 103, actinides, atomic mass [266]
- [Rutherfordium (Rf)](https://chemtable.org/rutherfordium): element 104, transition metals, atomic mass [267]
- [Dubnium (Db)](https://chemtable.org/dubnium): element 105, transition metals, atomic mass [268]
- [Seaborgium (Sg)](https://chemtable.org/seaborgium): element 106, transition metals, atomic mass [269]
- [Bohrium (Bh)](https://chemtable.org/bohrium): element 107, transition metals, atomic mass [270]
- [Hassium (Hs)](https://chemtable.org/hassium): element 108, transition metals, atomic mass [269]
- [Meitnerium (Mt)](https://chemtable.org/meitnerium): element 109, transition metals, atomic mass [278]
- [Darmstadtium (Ds)](https://chemtable.org/darmstadtium): element 110, transition metals, atomic mass [281]
- [Roentgenium (Rg)](https://chemtable.org/roentgenium): element 111, transition metals, atomic mass [282]
- [Copernicium (Cn)](https://chemtable.org/copernicium): element 112, transition metals, atomic mass [285]
- [Nihonium (Nh)](https://chemtable.org/nihonium): element 113, post-transition metals, atomic mass [286]
- [Flerovium (Fl)](https://chemtable.org/flerovium): element 114, post-transition metals, atomic mass [289]
- [Moscovium (Mc)](https://chemtable.org/moscovium): element 115, post-transition metals, atomic mass [290]
- [Livermorium (Lv)](https://chemtable.org/livermorium): element 116, post-transition metals, atomic mass [293]
- [Tennessine (Ts)](https://chemtable.org/tennessine): element 117, halogens, atomic mass [294]
- [Oganesson (Og)](https://chemtable.org/oganesson): element 118, noble gases, atomic mass [294]

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