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Chlorine: History & Applications

Chlorine is a chemical element; it has symbol Cl and atomic number 17. The second-lightest of the halogens, it appears between fluorine and bromine in the periodic table and its properties are mostly intermediate between them. Chlorine is a yellow-green gas at room temperature. It is an extremely reactive element and a strong oxidising agent: among the…

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Chlorine topic overview

The analysis highlights History and Applications as prominent areas in the source structure around Chlorine.

Related topics
390
Source areas
9
Connected nodes
399
Extracted relationships
320
Concept neighborhoods
82
Bridge connections
399

What this topic covers Research coverage

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.

Chemistry and compounds · 140 topics
Overview · 121 topics
History · 31 topics
Properties · 29 topics
Applications · 28 topics
Production · 15 topics
Hazards · 14 topics
Biological role · 8 topics
Occurrence · 4 topics

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.

Key facts & relationships

High-confidence facts extracted from structured source data. Use them as anchors for further research.

35Cl
75.8%
36Cl
trace
37Cl
24.2%
Appearance
pale yellow-green gas
at T (K)
128
Atomic number (Z)
17

Explore all related topics Closing gaps

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.

Overview

History

Properties

Chemistry and compounds

Occurrence

Production

Applications

Biological role

Hazards

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

How Chlorine connects Entity context

The extracted context around Chlorine shows recurring relationship patterns in the source. For example, Chlorine → Abu Bakr, Although, Another, Arabic, Around, Brabantian, Cremona, De, Discovery, Geber, Gerard, Hayyan, Helmont, However, II, Jabir, Jan Baptist, Latin, On, On Alums Another extracted example is Chlorine → About, AlCl3, AsCl3, BiCl3, Cl2O, HCl, HOCl, NaClO3, Other, PCl3, PCl5, POCl3, PVC, Quantitatively, SbCl3, SbCl5, SiCl4, SnCl4, Sodium, The. Use these groups to spot repeated connection types before inspecting the individual relationships.

Chlorine

Top relations

related to Early discoveries · 26
Chlorine → Abu Bakr, Although, Another, Arabic, Around, Brabantian, Cremona, De, Discovery, Geber, Gerard, Hayyan, Helmont, However, II, Jabir, Jan Baptist, Latin, On, On Alums
has application · 21
Chlorine → About, AlCl3, AsCl3, BiCl3, Cl2O, HCl, HOCl, NaClO3, Other, PCl3, PCl5, POCl3, PVC, Quantitatively, SbCl3, SbCl5, SiCl4, SnCl4, Sodium, The
related to Later uses · 21
Chlorine → Antoine-Germain Labarraque, Berthollet, Berthollet's, Charles Tennant, Chemische Fabrik Griesheim, Claude Berthollet, Eau, Elemental, France, French, Germany, In, Javel, Modern, Near, Paris, Scottish, Smith, The, These
related to Chlorine fluorides · 20
Chlorine → CF3, Cl2F, ClCN, ClF, ClN3, ClNCO, ClOSO2F, ClSCN, ClSO2F, COFCl, It, Its, NH, OH, RCF2NCl2, RCN, SO2, SO3, Some, The
related to External links · 20
Chlorine → Agency, AlternativesNational Pollutant Inventory, Chlorine PageChlorine Institute Archived, ChlorineElectrolytic, ChlorineNational Institute, Disease Registry, Environmental Considerations, Eurochlor, European, Health, Nottingham, Occupational Safety, Online, Production Using Mercury, The Periodic Table, Toxic Substances, Trade, University, Videos, Wayback Machine
related to Properties · 17
Chlorine → All, As, Br, Cl, Conversely, Corresponding, Fluorine, It, Its, Like, Ne, Specifically, The, This, Thus, Waals, X2
related to Other binary chlorides · 15
Chlorine → Br2, Chlorides, Chlorination, Cl2, Even, For, MoBr3, MoCl5, NCl3, Nearly, The, These, This, XeCl2, XeCl4
related to Organochlorine compounds · 14
Chlorine → Alkanes, Aryl, Chlorination, Cl, Due, Formally, Friedel-Crafts, However, Lewis, Like, PCl5, SOCl2, The, UV
related to Occurrence · 12
Chlorine → All, Along, Dead Sea, Earth's, Great Salt Lake, In, Israel, It, Small, The, This, Utah
related to Chemistry and compounds · 10
Chlorine → As, At, Br, Chlorination, Cl, Given, However, O2/H2O, This, X2/X

Important terminology

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

Important terminology

chloride water gas used sodium produced compounds acid hydrogen fluorine chemical may form element also oxygen elemental first bromine hypochlorite

Chlorine relationships Subject–Predicate–Object triples

TTTA extracted 320 structured relationships around Chlorine. Examples in this analysis include Chlorine → 35Cl → 75.8% and Chlorine → 36Cl → trace. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
Chlorine35Cl75.8%1.00infobox
Chlorine36Cltrace1.00infobox
Chlorine37Cl24.2%1.00infobox
ChlorineAppearancepale yellow-green gas1.00infobox
Chlorineat T (K)1281.00infobox
ChlorineAtomic number (Z)171.00infobox
ChlorineBlockp-block1.00infobox
ChlorineBoiling point(Cl2) 239.11 K ​(−34.04 °C, ​−29.27 °F)1.00infobox
ChlorineCAS NumberCl2: 7782-50-51.00infobox
ChlorineCovalent radius102±4 pm1.00infobox
ChlorineCritical point416.9 K, 7.991 MPa1.00infobox
ChlorineCrystal structure​orthorhombic (oS8)1.00infobox
ChlorineDensity (at STP)3.2 g/L1.00infobox
ChlorineDiscovery and first isolationCarl Wilhelm Scheele (1774)1.00infobox
ChlorineElectrical resistivity>10 Ω⋅m (at 20 °C)1.00infobox
ChlorineElectron configuration[Ne] 3s2 3p51.00infobox
ChlorineElectronegativityPauling scale: 3.161.00infobox
ChlorineElectrons per shell2, 8, 71.00infobox
ChlorineGroupgroup 17 (halogens)1.00infobox
ChlorineHeat of fusion(Cl2) 6.406 kJ/mol1.00infobox
ChlorineHeat of vaporisation(Cl2) 20.41 kJ/mol1.00infobox
ChlorineIonisation energies1st: 1251.2 kJ/mol1.00infobox
ChlorineIonisation energies2nd: 2298 kJ/mol1.00infobox
ChlorineIonisation energies3rd: 3822 kJ/mol1.00infobox
ChlorineIonisation energies(more)1.00infobox
ChlorineLattice constantsa = 630.80 pm b = 455.83 pm c = 815.49 pm (at triple point)1.00infobox
ChlorineMagnetic orderingdiamagnetic1.00infobox
ChlorineMain 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…1.00infobox
ChlorineMelting point(Cl2) 171.6 K ​(−101.5 °C, ​−150.7 °F)1.00infobox
ChlorineMolar heat capacity16.9745 J/(mol·K) (Cl) 33.949 J/(mol·K) (Cl2)1.00infobox

Related concept clusters Concept neighborhoods

The concept neighborhoods around Chlorine bring nearby vocabulary together. In this analysis, examples include Gas, Used and Water. Use the clusters to find adjacent concepts and terminology that may deserve separate research.

  • Chlorine
    • Gas
    • Used
    • Water
    • Chloride
    • Produced
    • Compounds
    • Sodium
    • Form
    • Elemental
    • Acid
    • Stable
    • Hydrogen
  • chlorine
    • Gas
    • Used
    • Water
    • Chloride
    • Produced
    • Compounds
    • Sodium
    • Form
    • Elemental
    • Acid
    • Stable
    • Hydrogen
  • chemical element
    • Chlorine
    • Used
    • Gas
    • Hydrogen
    • Oxygen
    • Acid
    • Chloride
    • Fluorine
    • High
    • Organic
    • Strong
    • Production
  • bromine
    • Fluorine
    • One
    • Cl
    • First
    • Agent
    • Oxidising
    • Known
    • Stable
    • Hydrogen
    • Also
    • Compounds
    • Chlorine
  • oxidising agent
    • Oxidising
    • Strong
    • One
    • Fluorine
    • High
    • Also
    • Bromine
    • May
    • Oxidation
    • Oxygen
    • First
    • Stable
  • oxygen
    • Reaction
    • Oxidation
    • Fluorine
    • Also
    • Solid
    • Strong
    • Production
    • Acid
    • Known
    • Stable
    • Chloride
    • Form
  • ammonium chloride
    • Hydrogen
    • Compounds
    • Sodium
    • Chlorine
    • Form
    • Production
    • May
    • Oxidation
    • Used
    • Produced
    • Acid
    • Element
  • sodium chloride
    • Hydrogen
    • Hypochlorite
    • Compounds
    • Sodium
    • Chlorine
    • Form
    • Solutions
    • Water
    • Production
    • May
    • Oxidation
    • Used

Connections between topic areas Semantic bridges

For Chlorine, one of the stronger structural bridges in this analysis connects Chlorine with Chemistry and compounds. Bridges highlight paths between different parts of the map and can reveal research angles that are easy to miss in a flat list.

Min side: 3
ChlorineChemistry and compounds · splits 259 ⟂ 141
ChlorineOverview · splits 278 ⟂ 122
ChlorineHistory · splits 368 ⟂ 32
ChlorineProperties · splits 370 ⟂ 30
ChlorineApplications · splits 371 ⟂ 29
ChlorineProduction · splits 384 ⟂ 16
ChlorineHazards · splits 385 ⟂ 15
ChlorineBiological role · splits 391 ⟂ 9
ChlorineOccurrence · splits 395 ⟂ 5

Map overview Semantic statistics

Chlorine

Nodes400
Edges399
Triples320
Avg. degree2
Density0.005
Components1

Source & methodology

TTTA analyzes the structure around Chlorine to surface related topics, entities, relationships, concept neighborhoods and bridge connections. Use the map to explore areas such as History & Applications, including less central topics that may reveal useful research gaps. Automatically extracted connections are research leads rather than rewritten encyclopedia content.

Source: Wikipedia — Chlorine · EN edition · Analysis: TopicsToTalkAbout

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