Research any topic before you write.
Find related topics. | Discover entities. | See connections. | Build a topical map.
Lanthanum is a chemical element; it has symbol La and atomic number 57. It is a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air. It is the first and the prototype of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table. Lanthanum is traditionally counted among the…
Characters, History & Applications
Explore the main themes, entities and connections around Lanthanum. Start with the topic map, then use the sections below for research and deeper semantic analysis.
Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.
High-confidence facts extracted from structured source data. Use them as anchors for further research.
Browse the full topic structure. Each item opens a new analysis centered on that subject.
Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.
See the strongest relationship patterns around the current topic before diving into the raw triples.
Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.
la elements used cerium rare-earth oxide compounds lanthanides metal electrons rare first carbon lanthanide element high stable carbonate chemical yttrium
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Lanthanum | 137La | synth | 1.00 | infobox |
| Lanthanum | 138La | 0.0890% | 1.00 | infobox |
| Lanthanum | 139La | 99.9% | 1.00 | infobox |
| Lanthanum | 140La | synth | 1.00 | infobox |
| Lanthanum | Appearance | silvery white | 1.00 | infobox |
| Lanthanum | at T (K) | 2005 | 1.00 | infobox |
| Lanthanum | Atomic number (Z) | 57 | 1.00 | infobox |
| Lanthanum | Atomic radius | empirical: 187 pm | 1.00 | infobox |
| Lanthanum | Block | f-block | 1.00 | infobox |
| Lanthanum | Boiling point | 3737 K (3464 °C, 6267 °F) | 1.00 | infobox |
| Lanthanum | Brinell hardness | 350–400 MPa | 1.00 | infobox |
| Lanthanum | Bulk modulus | α form: 27.9 GPa | 1.00 | infobox |
| Lanthanum | CAS Number | 7439-91-0 | 1.00 | infobox |
| Lanthanum | Covalent radius | 207±8 pm | 1.00 | infobox |
| Lanthanum | Crystal structure | α form: double hexagonal close-packed (dhcp) (hP4) | 1.00 | infobox |
| Lanthanum | Density (at 20° C) | 6.145 g/cm3 | 1.00 | infobox |
| Lanthanum | Discovery | Carl Gustaf Mosander (1838) | 1.00 | infobox |
| Lanthanum | Electrical resistivity | α, poly: 615 nΩ⋅m (at r.t.) | 1.00 | infobox |
| Lanthanum | Electron configuration | [Xe] 5d1 6s2 | 1.00 | infobox |
| Lanthanum | Electronegativity | Pauling scale: 1.10 | 1.00 | infobox |
| Lanthanum | Electrons per shell | 2, 8, 18, 18, 9, 2 | 1.00 | infobox |
| Lanthanum | Group | f-block groups (no number) | 1.00 | infobox |
| Lanthanum | Heat of fusion | 6.20 kJ/mol | 1.00 | infobox |
| Lanthanum | Heat of vaporization | 400 kJ/mol | 1.00 | infobox |
| Lanthanum | Ionization energies | 1st: 538.1 kJ/mol | 1.00 | infobox |
| Lanthanum | Ionization energies | 2nd: 1067 kJ/mol | 1.00 | infobox |
| Lanthanum | Ionization energies | 3rd: 1850.3 kJ/mol | 1.00 | infobox |
| Lanthanum | Lattice constants | a = 0.37742 nm c = 1.2171 nm (at 20 °C) | 1.00 | infobox |
| Lanthanum | Magnetic ordering | paramagnetic | 1.00 | infobox |
| Lanthanum | Main isotopes | .mw-parser-output .isotopes-table{text-align:center;width:100%;border-collapse:collapse;margin:0;padding:0}.mw-parser-output .isotopes-table-headers>:not(:first-child){padding:0… | 1.00 | infobox |
These clusters group vocabulary that occurs around closely connected concepts in the source material.
Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.