Research any topic before you write.
Find related topics. | Discover entities. | See connections. | Build a topical map.
Hydrogen is a chemical element; it has the symbol H and atomic number 1. It is the lightest and most abundant chemical element in the universe, constituting about 75% of all normal matter. Under standard conditions, hydrogen is a gas of diatomic molecules with the formula H2, called dihydrogen, or sometimes hydrogen gas, molecular hydrogen, or simply…
The analysis highlights History, Applications and Standards as prominent areas in the source structure around Hydrogen.
Source areas are shown by the number of related topics found in each part of the analysis. Use smaller areas too: they can reveal specialized angles and content gaps.
Smaller areas are not necessarily less important. They contain fewer connections in this analysis and can be useful for finding specialized angles or coverage gaps.
High-confidence facts extracted from structured source data. Use them as anchors for further research.
Browse the complete topic structure, not only the most central items. Less prominent entities and concepts can reveal missing angles, specialized context and useful research gaps. 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.
The extracted context around Hydrogen shows recurring relationship patterns in the source. For example, Hydrogen → Cambridge, Chart, Climate, David, Eric, Fact, Fiction, Franklin Watts, Harvard University Press, ISBN, Island Press, Its Significance, Its Story, John, Joseph, Knolls Atomic Power Laboratory, Massachusetts, New York, Newton, Nuclides Another extracted example is Hydrogen → Basic, Berkeley, Burkhard Militzer, California, Drexel University, Georgia State University, High, HyperPhysics, Nottingham, The Periodic Table, Timothy Jones, University, Videos, Wavefunction, Wayback Machine. Use these groups to spot repeated connection types before inspecting the individual relationships.
Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.
gas h2 water used also compounds production produced energy proton form carbon reaction deuterium fuel molecules electron metals temperature low
TTTA extracted 266 structured relationships around Hydrogen. Examples in this analysis include Hydrogen → 1H → 99.9855% and Hydrogen → 2H → 0.0115%. The table shows each extracted connection, where it came from and its confidence.
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Hydrogen | 1H | 99.9855% | 1.00 | infobox |
| Hydrogen | 2H | 0.0115% | 1.00 | infobox |
| Hydrogen | 3H | trace | 1.00 | infobox |
| Hydrogen | Appearance | Colorless gas | 1.00 | infobox |
| Hydrogen | Atomic number (Z) | 1 | 1.00 | infobox |
| Hydrogen | Block | s-block | 1.00 | infobox |
| Hydrogen | Boiling point | (H2) 20.271 K (−252.879 °C, −423.182 °F) | 1.00 | infobox |
| Hydrogen | CAS Number | 12385-13-6 1333-74-0 (H2) | 1.00 | infobox |
| Hydrogen | Covalent radius | 31±5 pm | 1.00 | infobox |
| Hydrogen | Critical point | 32.938 K, 1.2858 MPa | 1.00 | infobox |
| Hydrogen | Crystal structure | hexagonal (hP4) | 1.00 | infobox |
| Hydrogen | Density (at STP) | 0.08988 g/L | 1.00 | infobox |
| Hydrogen | Discovery and first isolation | Henry Cavendish (1766) | 1.00 | infobox |
| Hydrogen | Electron configuration | 1s1 | 1.00 | infobox |
| Hydrogen | Electronegativity | Pauling scale: 2.20 | 1.00 | infobox |
| Hydrogen | Electrons per shell | 1 | 1.00 | infobox |
| Hydrogen | Group | group 1: hydrogen and alkali metals | 1.00 | infobox |
| Hydrogen | Heat of fusion | (H2) 0.117 kJ/mol | 1.00 | infobox |
| Hydrogen | Heat of vaporization | (H2) 0.904 kJ/mol | 1.00 | infobox |
| Hydrogen | Ionization energies | 1st: 1312.0 kJ/mol | 1.00 | infobox |
| Hydrogen | Lattice constants | a = 378.97 pm c = 618.31 pm (at triple point) | 1.00 | infobox |
| Hydrogen | Magnetic ordering | diamagnetic | 1.00 | infobox |
| Hydrogen | 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 |
| Hydrogen | Melting point | (.mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:… | 1.00 | infobox |
| Hydrogen | Molar heat capacity | 14.418 J/(mol·K) (H) 28.836 J/(mol·K) (H2) | 1.00 | infobox |
| Hydrogen | Molar magnetic susceptibility | −3.98×10−6 cm3/mol (298 K) | 1.00 | infobox |
| Hydrogen | Named by | Antoine Lavoisier (1783) | 1.00 | infobox |
| Hydrogen | Naming | name means 'water-former' in Greek | 1.00 | infobox |
| Hydrogen | Natural occurrence | primordial | 1.00 | infobox |
| Hydrogen | Oxidation states | common: −1, +1 | 1.00 | infobox |
The concept neighborhoods around Hydrogen bring nearby vocabulary together. In this analysis, examples include Water, Produced and H2. Use the clusters to find adjacent concepts and terminology that may deserve separate research.
For Hydrogen, one of the stronger structural bridges in this analysis connects Hydrogen with Overview. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.
TTTA analyzes the structure around Hydrogen to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History, Applications & Standards, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.
Source: Wikipedia — Hydrogen · EN edition · Analysis: TopicsToTalkAbout