Known crystal structures by chemical element (Crystallography Open Database)
How many published crystal structures in the Crystallography Open Database contain each chemical element, and how many of those are the pure element or two-element compounds. One row per element.
Columns
Stable keys — use them in the API, SQL and code
| Key | Name | Type | Description |
|---|---|---|---|
| atomic_number | Z | integer | — |
| symbol | Symbol | string | — |
| element | Element | string | — |
| structures | Crystal structures | integer | COD entries containing the element. |
| pure_element | Pure element | integer | Entries made of this element only. |
| binary_compounds | Two-element compounds | integer | Entries with exactly two elements, including this one. |
More in Chemistry & Materials
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.
Energy levels of neutral atoms: gallium onward (Z 31+)
Energy levels of neutral atoms of the elements from gallium onward (atomic number 31 and up), from the NIST Atomic Spectra Database: each level's electron configuration, term, total angular momentum J and energy above the ground state. One row per level (plus the ionization limits NIST lists).
U.S. toxic chemical releases by chemical and year (EPA TRI)
How much of each listed toxic chemical U.S. industrial facilities reported releasing to air, water and land, every year since 1987, from the EPA Toxics Release Inventory. One row per chemical per year.
Energy levels of neutral atoms: hydrogen to zinc (Z 1–30)
Energy levels of neutral atoms of the elements hydrogen through zinc (atomic numbers 1–30), from the NIST Atomic Spectra Database: each level's electron configuration, term, total angular momentum J and energy above the ground state. One row per level (plus the ionization limits NIST lists).
Strong spectral lines of the elements
The strongest emission lines of 99 elements, from hydrogen to einsteinium, as tabulated in NIST's Handbook of Basic Atomic Spectroscopic Data. One row per spectral line: element, ion stage, wavelength, relative intensity and whether it is a persistent line.
Energy levels of singly ionized atoms: gallium onward (Z 31+)
Energy levels of singly charged positive ions (atoms that have lost one electron, e.g. Fe⁺, written Fe II) of the elements from gallium onward (atomic number 31 and up), from the NIST Atomic Spectra Database: each level's electron configuration, term, total angular momentum J and energy above the ion's ground state. One row per level (plus the ionization limits NIST lists).