Periodic Table Explorer
Browse all 118 chemical elements with atomic mass, electron configuration, melting points and more.
Showing all 118 elements.
- Alkali metal
- Alkaline earth metal
- Transition metal
- Post-transition metal
- Metalloid
- Reactive nonmetal
- Halogen
- Noble gas
- Lanthanide
- Actinide
Hydrogen
Reactive nonmetal
- Atomic number
- 1
- Atomic mass
- 1.008 u
- Group
- 1
- Period
- 1
- Block
- s
- Phase at 20 °C
- Gas
- Electron configuration
- 1s¹
- Electronegativity
- 2.20
- Melting point
- 13.99 K
- Boiling point
- 20.28 K
- Density
- 0.00009 g/cm³
- Discovered
- 1766
How it works
This interactive periodic table holds all 118 known chemical elements — from hydrogen to oganesson — with their atomic number, standard atomic mass, electron configuration, group, period, block, electronegativity, melting and boiling points, density and year of discovery. Click (or tab to and press Enter on) any element to open its full data card, search by name, symbol or atomic number to spotlight matches, and recolour the table by category, by phase at room temperature, or by s/p/d/f block to see the trends jump out.
Values for the superheavy elements above atomic number 100 are largely predicted rather than measured, so some fields show “unknown”. The whole table is embedded in the page and runs on plain JavaScript in your browser: nothing is fetched from a server, nothing you search for is logged, and the CSV export is generated locally from whatever selection you are looking at.
Frequently asked questions
How many elements are in the periodic table?
There are 118 confirmed chemical elements, from hydrogen (atomic number 1) to oganesson (atomic number 118). All 118 are included here, along with the 15 lanthanides and 15 actinides shown in the two rows below the main table. Everything above atomic number 94 is synthetic, and for the heaviest elements many properties are predicted rather than measured, so some fields show "unknown".
Can I see the electron configuration of each element?
Yes. Click any element and its data card shows the full electron configuration in noble-gas shorthand — iron, for example, is [Ar] 3d⁶ 4s², and gold is [Xe] 4f¹⁴ 5d¹⁰ 6s¹. The card also lists group, period, s/p/d/f block, electronegativity, melting and boiling point in kelvin and Celsius, density, phase at room temperature and the year the element was discovered.
Can I export the periodic table data?
Yes. The Download CSV button exports whatever you are currently looking at — all 118 elements, or just the ones matching your search and category filter — as a comma-separated file you can open in Excel, Google Sheets or Numbers. There is also a Copy button that puts the selected element's full data card on your clipboard as plain text. Both files are built in your browser; nothing is uploaded.