Periodic table of the elements
All 118 chemical elements with atomic mass, electron configuration, electronegativity, melting and boiling points, density and year of discovery. One row per element.
118 rows21 columns Updated 7 h ago Public domain (U.S. Government work) / CC0 1.0
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Columns
Stable keys — use them in the API, SQL and code
| Key | Name | Type | Description |
|---|---|---|---|
| atomic_number | Z | integer | Number of protons in the nucleus. |
| symbol | Symbol | string | — |
| name | Element | string | — |
| wikidata | Wikidata | entity | — |
| atomic_mass | Atomic mass | number · u | Standard atomic weight in unified atomic mass units. |
| period | Period | integer | — |
| group | Group | integer | IUPAC group 1–18. Empty for lanthanides and actinides. |
| block | Block | string | — |
| group_block | Category | string | Element family, e.g. Noble gas, Transition metal. |
| standard_state | State at STP | string | — |
| electron_configuration | Electron configuration | string | — |
| electronegativity | Electronegativity | number · Pauling | — |
| atomic_radius | Atomic radius | number · pm | Van der Waals radius in picometres. |
| ionization_energy | Ionization energy | number · eV | First ionization energy. |
| electron_affinity | Electron affinity | number · eV | — |
| oxidation_states | Oxidation states | string | — |
| melting_point | Melting point | number · K | — |
| boiling_point | Boiling point | number · K | — |
| density | Density | number · g/cm³ | At standard conditions; gases in g/cm³ at 0 °C. |
| year_discovered | Discovered | string | Year of discovery, or 'Ancient'. |
| cpk_color | CPK color | string | — |