Rows 9 and 10 display lanthanides and actinides. Data source includes all known elements (1-118).
Interactive Periodic Table of Elements
In short: Interactive periodic table with all 118 elements: atomic mass, electron configuration, electronegativity, density and ionization energy. It is free, works in your web browser and needs no download.
Explore all 118 elements with atomic number, atomic mass, symbol, category, phase, electron configuration, electronegativity, density, melting point, boiling point, and first ionization energy. Search by element name, symbol, or atomic number, then click any tile to inspect details.
Quick answer: This free interactive periodic table lets you search the periodic table of elements and view atomic mass, atomic number, chemical symbol, phase, group, period, electron configuration, density, melting point, boiling point, and ionization energy in one browser tool.
Interactive periodic table with atomic mass and element data
Use this periodic table of elements interactive tool to look up core element properties while studying chemistry, preparing lesson material, or checking quick reference data. The table includes every currently named element from hydrogen to oganesson.
- Search by element name, symbol, or atomic number.
- Filter elements by category and phase.
- Open details for atomic mass, group, period, block, density, and electron configuration.
- Check melting point, boiling point, molar heat, and first ionization energy where available.
When to use it
Use this page when you need a fast online periodic table with atomic mass, chemical symbols, element categories, and physical property metadata. For molecule drawing and structure conversion, open the MolDraw editor or browse the chemistry tools hub.
High-demand element lookups
Students often search for specific facts such as krypton 86, all 118 elements, ytterbium first ionization energy in kJ/mol, and first ionization energy trends across aluminum, manganese, zirconium, and ytterbium. Use the search box to jump directly to an element and open the details panel for atomic mass, ionization energy, phase, density, and electron configuration.
List of all 118 elements with atomic mass
Standard atomic weights (IUPAC abridged values). Values in brackets are the mass number of the longest-lived isotope for elements with no stable isotope.
Show the full element table
| Z | Symbol | Element | Atomic mass (u) | Group | Period | Category |
|---|---|---|---|---|---|---|
| 1 | H | Hydrogen | 1.008 | 1 | 1 | diatomic nonmetal |
| 2 | He | Helium | 4.0026 | 18 | 1 | noble gas |
| 3 | Li | Lithium | 6.94 | 1 | 2 | alkali metal |
| 4 | Be | Beryllium | 9.0122 | 2 | 2 | alkaline earth metal |
| 5 | B | Boron | 10.81 | 13 | 2 | metalloid |
| 6 | C | Carbon | 12.011 | 14 | 2 | polyatomic nonmetal |
| 7 | N | Nitrogen | 14.007 | 15 | 2 | diatomic nonmetal |
| 8 | O | Oxygen | 15.999 | 16 | 2 | diatomic nonmetal |
| 9 | F | Fluorine | 18.998 | 17 | 2 | diatomic nonmetal |
| 10 | Ne | Neon | 20.18 | 18 | 2 | noble gas |
| 11 | Na | Sodium | 22.99 | 1 | 3 | alkali metal |
| 12 | Mg | Magnesium | 24.305 | 2 | 3 | alkaline earth metal |
| 13 | Al | Aluminium | 26.982 | 13 | 3 | post-transition metal |
| 14 | Si | Silicon | 28.085 | 14 | 3 | metalloid |
| 15 | P | Phosphorus | 30.974 | 15 | 3 | polyatomic nonmetal |
| 16 | S | Sulfur | 32.06 | 16 | 3 | polyatomic nonmetal |
| 17 | Cl | Chlorine | 35.45 | 17 | 3 | diatomic nonmetal |
| 18 | Ar | Argon | 39.948 | 18 | 3 | noble gas |
| 19 | K | Potassium | 39.098 | 1 | 4 | alkali metal |
| 20 | Ca | Calcium | 40.078 | 2 | 4 | alkaline earth metal |
| 21 | Sc | Scandium | 44.956 | 3 | 4 | transition metal |
| 22 | Ti | Titanium | 47.867 | 4 | 4 | transition metal |
| 23 | V | Vanadium | 50.942 | 5 | 4 | transition metal |
| 24 | Cr | Chromium | 51.996 | 6 | 4 | transition metal |
| 25 | Mn | Manganese | 54.938 | 7 | 4 | transition metal |
| 26 | Fe | Iron | 55.845 | 8 | 4 | transition metal |
| 27 | Co | Cobalt | 58.933 | 9 | 4 | transition metal |
| 28 | Ni | Nickel | 58.693 | 10 | 4 | transition metal |
| 29 | Cu | Copper | 63.546 | 11 | 4 | transition metal |
| 30 | Zn | Zinc | 65.38 | 12 | 4 | transition metal |
| 31 | Ga | Gallium | 69.723 | 13 | 4 | post-transition metal |
| 32 | Ge | Germanium | 72.63 | 14 | 4 | metalloid |
| 33 | As | Arsenic | 74.922 | 15 | 4 | metalloid |
| 34 | Se | Selenium | 78.971 | 16 | 4 | polyatomic nonmetal |
| 35 | Br | Bromine | 79.904 | 17 | 4 | diatomic nonmetal |
| 36 | Kr | Krypton | 83.798 | 18 | 4 | noble gas |
| 37 | Rb | Rubidium | 85.468 | 1 | 5 | alkali metal |
| 38 | Sr | Strontium | 87.62 | 2 | 5 | alkaline earth metal |
| 39 | Y | Yttrium | 88.906 | 3 | 5 | transition metal |
| 40 | Zr | Zirconium | 91.224 | 4 | 5 | transition metal |
| 41 | Nb | Niobium | 92.906 | 5 | 5 | transition metal |
| 42 | Mo | Molybdenum | 95.95 | 6 | 5 | transition metal |
| 43 | Tc | Technetium | [98] | 7 | 5 | transition metal |
| 44 | Ru | Ruthenium | 101.07 | 8 | 5 | transition metal |
| 45 | Rh | Rhodium | 102.91 | 9 | 5 | transition metal |
| 46 | Pd | Palladium | 106.42 | 10 | 5 | transition metal |
| 47 | Ag | Silver | 107.87 | 11 | 5 | transition metal |
| 48 | Cd | Cadmium | 112.41 | 12 | 5 | transition metal |
| 49 | In | Indium | 114.82 | 13 | 5 | post-transition metal |
| 50 | Sn | Tin | 118.71 | 14 | 5 | post-transition metal |
| 51 | Sb | Antimony | 121.76 | 15 | 5 | metalloid |
| 52 | Te | Tellurium | 127.6 | 16 | 5 | metalloid |
| 53 | I | Iodine | 126.9 | 17 | 5 | diatomic nonmetal |
| 54 | Xe | Xenon | 131.29 | 18 | 5 | noble gas |
| 55 | Cs | Cesium | 132.91 | 1 | 6 | alkali metal |
| 56 | Ba | Barium | 137.33 | 2 | 6 | alkaline earth metal |
| 57 | La | Lanthanum | 138.91 | 3 | 6 | lanthanide |
| 58 | Ce | Cerium | 140.12 | 3 | 6 | lanthanide |
| 59 | Pr | Praseodymium | 140.91 | 3 | 6 | lanthanide |
| 60 | Nd | Neodymium | 144.24 | 3 | 6 | lanthanide |
| 61 | Pm | Promethium | [145] | 3 | 6 | lanthanide |
| 62 | Sm | Samarium | 150.36 | 3 | 6 | lanthanide |
| 63 | Eu | Europium | 151.96 | 3 | 6 | lanthanide |
| 64 | Gd | Gadolinium | 157.25 | 3 | 6 | lanthanide |
| 65 | Tb | Terbium | 158.93 | 3 | 6 | lanthanide |
| 66 | Dy | Dysprosium | 162.5 | 3 | 6 | lanthanide |
| 67 | Ho | Holmium | 164.93 | 3 | 6 | lanthanide |
| 68 | Er | Erbium | 167.26 | 3 | 6 | lanthanide |
| 69 | Tm | Thulium | 168.93 | 3 | 6 | lanthanide |
| 70 | Yb | Ytterbium | 173.05 | 3 | 6 | lanthanide |
| 71 | Lu | Lutetium | 174.97 | 3 | 6 | lanthanide |
| 72 | Hf | Hafnium | 178.49 | 4 | 6 | transition metal |
| 73 | Ta | Tantalum | 180.95 | 5 | 6 | transition metal |
| 74 | W | Tungsten | 183.84 | 6 | 6 | transition metal |
| 75 | Re | Rhenium | 186.21 | 7 | 6 | transition metal |
| 76 | Os | Osmium | 190.23 | 8 | 6 | transition metal |
| 77 | Ir | Iridium | 192.22 | 9 | 6 | transition metal |
| 78 | Pt | Platinum | 195.08 | 10 | 6 | transition metal |
| 79 | Au | Gold | 196.97 | 11 | 6 | transition metal |
| 80 | Hg | Mercury | 200.59 | 12 | 6 | transition metal |
| 81 | Tl | Thallium | 204.38 | 13 | 6 | post-transition metal |
| 82 | Pb | Lead | 207.2 | 14 | 6 | post-transition metal |
| 83 | Bi | Bismuth | 208.98 | 15 | 6 | post-transition metal |
| 84 | Po | Polonium | [209] | 16 | 6 | post-transition metal |
| 85 | At | Astatine | [210] | 17 | 6 | metalloid |
| 86 | Rn | Radon | [222] | 18 | 6 | noble gas |
| 87 | Fr | Francium | [223] | 1 | 7 | alkali metal |
| 88 | Ra | Radium | [226] | 2 | 7 | alkaline earth metal |
| 89 | Ac | Actinium | [227] | 3 | 7 | actinide |
| 90 | Th | Thorium | 232.04 | 3 | 7 | actinide |
| 91 | Pa | Protactinium | 231.04 | 3 | 7 | actinide |
| 92 | U | Uranium | 238.03 | 3 | 7 | actinide |
| 93 | Np | Neptunium | [237] | 3 | 7 | actinide |
| 94 | Pu | Plutonium | [244] | 3 | 7 | actinide |
| 95 | Am | Americium | [243] | 3 | 7 | actinide |
| 96 | Cm | Curium | [247] | 3 | 7 | actinide |
| 97 | Bk | Berkelium | [247] | 3 | 7 | actinide |
| 98 | Cf | Californium | [251] | 3 | 7 | actinide |
| 99 | Es | Einsteinium | [252] | 3 | 7 | actinide |
| 100 | Fm | Fermium | [257] | 3 | 7 | actinide |
| 101 | Md | Mendelevium | [258] | 3 | 7 | actinide |
| 102 | No | Nobelium | [259] | 3 | 7 | actinide |
| 103 | Lr | Lawrencium | [266] | 3 | 7 | actinide |
| 104 | Rf | Rutherfordium | [267] | 4 | 7 | transition metal |
| 105 | Db | Dubnium | [268] | 5 | 7 | transition metal |
| 106 | Sg | Seaborgium | [269] | 6 | 7 | transition metal |
| 107 | Bh | Bohrium | [270] | 7 | 7 | transition metal |
| 108 | Hs | Hassium | [269] | 8 | 7 | transition metal |
| 109 | Mt | Meitnerium | [278] | 9 | 7 | unknown, probably transition metal |
| 110 | Ds | Darmstadtium | [281] | 10 | 7 | unknown, probably transition metal |
| 111 | Rg | Roentgenium | [282] | 11 | 7 | unknown, probably transition metal |
| 112 | Cn | Copernicium | [285] | 12 | 7 | transition metal |
| 113 | Nh | Nihonium | [286] | 13 | 7 | unknown, probably transition metal |
| 114 | Fl | Flerovium | [289] | 14 | 7 | post-transition metal |
| 115 | Mc | Moscovium | [290] | 15 | 7 | unknown, probably post-transition metal |
| 116 | Lv | Livermorium | [293] | 16 | 7 | unknown, probably post-transition metal |
| 117 | Ts | Tennessine | [294] | 17 | 7 | unknown, probably metalloid |
| 118 | Og | Oganesson | [294] | 18 | 7 | unknown, predicted to be noble gas |
Element property data: Periodic-Table-JSON (CC BY-SA 3.0, derived from Wikipedia).
How to use the interactive periodic table
- Search by element name, symbol or atomic number, or filter by category and phase.
- Click any tile to open the details panel with atomic mass, configuration, electronegativity, ionization energy, density and melting/boiling points.
- Expand the element list below for a printable table of all 118 atomic masses.
- Jump to the molar mass or electron configuration calculators for worked answers.
Worked examples
Why is chlorine 35.45?
Natural Cl is 75.8% 35Cl (34.969 u) and 24.2% 37Cl (36.966 u).
0.758 × 34.969 + 0.242 × 36.966 ≈ 35.45 u
Valence electrons from the group
Group 16 (O, S) → 6 valence electrons; Group 1 → 1.
Oxygen: [He] 2s2 2p4 → 6
Trend check
Across period 3, electronegativity rises from Na (0.93) to Cl (3.16).
F (3.98) is the most electronegative element.
From elements to molecules: draw any compound in MolDraw and get its formula and molar mass instantly.
Open MolDraw editorFrequently asked questions
How many elements are on the periodic table?
118, from hydrogen (Z = 1) to oganesson (Z = 118). All of them are shown, including the lanthanides and actinides in the two rows below the main table.
How do I read the periodic table?
Elements are ordered by atomic number. Rows (periods) show the number of electron shells; columns (groups) share similar valence electrons and chemistry, e.g. Group 1 alkali metals and Group 17 halogens.
What is atomic mass?
The weighted average mass of an element's naturally occurring isotopes in atomic mass units (u). Numerically it equals the molar mass in g/mol, e.g. carbon 12.011.
Why are some atomic masses in brackets?
Elements such as technetium and those beyond bismuth have no stable isotope, so the mass number of the longest-lived isotope is given instead, e.g. Tc [98].
How can I find an element's electron configuration?
Click the element tile to see it in the details panel, or use the electron configuration calculator for full and noble-gas notation, ions and exceptions such as Cr and Cu.
Can I search the periodic table by symbol or number?
Yes. Type a name, symbol or atomic number into the search box, or filter by category (metals, halogens, noble gases…) and phase.
Related chemistry tools
Need to sketch molecules for a report? Draw chemical structures online with MolDraw, a free online ChemDraw alternative (see the ChemDraw vs MolDraw comparison).
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