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Selenium: Characters, History, Applications & Art

Selenium is a chemical element; it has symbol Se and atomic number 34. It has various physical appearances, including a brick-red powder, a vitreous black solid, and a grey metallic-looking form. It seldom occurs in this elemental state or as pure ore compounds in Earth's crust. Selenium (from σελήνη 'moon') was discovered in 1817 by Jöns Jacob…

Language: English [EN]
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Selenium topic overview

The analysis highlights Characters, History, Applications and Art as prominent areas in the source structure around Selenium.

Related topics
254
Source areas
9
Connected nodes
263
Extracted relationships
289
Concept neighborhoods
47
Bridge connections
263

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.

Chemical compounds · 61 topics
Biological role · 50 topics
Overview · 31 topics
History · 28 topics
Applications · 26 topics
Characteristics · 26 topics
Pollution · 13 topics
Production · 12 topics
Occurrence · 7 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.

72Se
synth
74Se
0.860%
75Se
synth
76Se
9.23%
77Se
7.60%
78Se
23.7%

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

Characteristics

Chemical compounds

History

Occurrence

Production

Applications

Pollution

Biological role

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 Selenium connects Entity context

The extracted context around Selenium shows recurring relationship patterns in the source. For example, Selenium → Alexander Graham Bell, Alexander Marcet, Because, Berzelius, Berzelius's, Both, Earth, Falun Mine, Gahn, Greek, Gripsholm, Hence, However, In, Johan Gottlieb Gahn, Jöns Jacob Berzelius, Marcet, Moon, Pyrite, Selenium's Another extracted example is Selenium → Alkali, Analogous, Cu, Ga, H2S, H2Se, HgSe, HSe, Illustrative, In, It, PbSe, Se2, The, These, With, ZnSe. Use these groups to spot repeated connection types before inspecting the individual relationships.

Selenium

Top relations

related to history · 26
Selenium → Alexander Graham Bell, Alexander Marcet, Because, Berzelius, Berzelius's, Both, Earth, Falun Mine, Gahn, Greek, Gripsholm, Hence, However, In, Johan Gottlieb Gahn, Jöns Jacob Berzelius, Marcet, Moon, Pyrite, Selenium's
related to Metal selenides · 17
Selenium → Alkali, Analogous, Cu, Ga, H2S, H2Se, HgSe, HSe, Illustrative, In, It, PbSe, Se2, The, These, With, ZnSe
related to External links · 13
Selenium → Chemical HazardsPeter, Health, Krogt, National Institutes, NIOSH Pocket Guide, Nottingham, SeleniumAssay Archived, SeleniumCDC, The Periodic Table, Toxicological Profile, University, Videos, Wayback MachineATSDR
related to Solar cells · 13
Selenium → Akio Kunioka, As, Charles Fritts, English, Following, However, IBM, In, Only, Recent, Richard Evans Day, Tokio Nakada, William Grylls Adams
related to Toxicity · 13
Selenium → Although, By, Chinese, Elemental, Exceeding, Extreme, Hydrogen, In China, Se, Symptoms, The, This, Tolerable Upper Intake Level
related to Physical properties · 12
Selenium → Black, CS2, In, Other, Se, Se6, Se7, Se8, The, They, Upon, When
related to Organoselenium compounds · 11
Selenium → Consistent, Especially, II, R2Se, R2Se2, Representatives, RSe, RSeH, Se, The, They
is a · 10
Selenium → brittle, chemical element, cofactor for the three thyroid hormone deiodinases, component of the unusual amino acids selenocysteine and selenomethionine, essential micronutrient for animals, essential trace element, rare mineral, semiconductor and is used in photocells, semiconductor showing appreciable photoconductivity, trace element nutrient that functions as cofactor for reduction of antioxidant enzymes
related to Nutritional sources of selenium · 10
Selenium → Allowance, Brazil, Dietary, Drug Administration, FDA, In June, RDA, Selenium-specific, The US Recommended Dietary, US Food
related to Other uses · 9
Selenium → Cadmium, Ionized, Its, LEDs, Se, Sheets, The, X-ray, Zinc

Important terminology

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

Important terminology

used may sulfur compounds forms copper lead also selenide se form toxic μg element acid plants high found dietary many

Selenium relationships Subject–Predicate–Object triples

TTTA extracted 289 structured relationships around Selenium. Examples in this analysis include Selenium → 72Se → synth and Selenium → 74Se → 0.860%. The table shows each extracted connection, where it came from and its confidence.

SubjectPredicateObjectConfidenceSrc
Selenium72Sesynth1.00infobox
Selenium74Se0.860%1.00infobox
Selenium75Sesynth1.00infobox
Selenium76Se9.23%1.00infobox
Selenium77Se7.60%1.00infobox
Selenium78Se23.7%1.00infobox
Selenium79Setrace1.00infobox
Selenium80Se49.8%1.00infobox
Selenium82Se8.82%1.00infobox
SeleniumAppearancegrey metallic-looking, red, and vitreous black (not pictured) allotropes1.00infobox
Seleniumat T (K)5001.00infobox
SeleniumAtomic number (Z)341.00infobox
SeleniumAtomic radiusempirical: 120 pm1.00infobox
SeleniumBlockp-block1.00infobox
SeleniumBoiling point958 K ​(685 °C, ​1265 °F)1.00infobox
SeleniumBrinell hardness736 MPa1.00infobox
SeleniumBulk modulus8.3 GPa1.00infobox
SeleniumCAS Number7782-49-21.00infobox
SeleniumCovalent radius120±4 pm1.00infobox
SeleniumCritical point1766 K, 27.2 MPa1.00infobox
SeleniumCrystal structuregrey: ​hexagonal (hP3)1.00infobox
SeleniumDensity (near r.t.)gray: 4.81 g/cm3 alpha: 4.39 g/cm3 vitreous: 4.28 g/cm31.00infobox
SeleniumDiscovery and first isolationJöns Jakob Berzelius and Johann Gottlieb Gahn (1817)1.00infobox
SeleniumElectron configuration[Ar] 3d10 4s2 4p41.00infobox
SeleniumElectronegativityPauling scale: 2.551.00infobox
SeleniumElectrons per shell2, 8, 18, 61.00infobox
SeleniumGroupgroup 16 (chalcogens)1.00infobox
SeleniumHeat of fusiongray: 6.69 kJ/mol1.00infobox
SeleniumHeat of vaporization95.48 kJ/mol1.00infobox
SeleniumIonization energies1st: 941.0 kJ/mol1.00infobox

Related concept clusters Concept neighborhoods

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

  • Selenium
    • May
    • Forms
    • Used
    • Sulfur
    • Also
    • Dioxide
    • Many
    • Plants
    • Copper
    • Toxic
    • Animals
    • Fish
  • selenium
    • May
    • Forms
    • Used
    • Sulfur
    • Also
    • Dioxide
    • Many
    • Plants
    • Copper
    • Toxic
    • Animals
    • Fish
  • selenium dioxide
    • Acid
    • Elemental
    • Sulfur
    • Forms
    • Produced
    • Form
    • May
    • Used
    • Stable
    • Also
    • Water
    • Dioxide
  • selenium trioxide
    • May
    • Forms
    • Used
    • Sulfur
    • Also
    • Dioxide
    • Many
    • Plants
    • Copper
    • Toxic
    • Animals
    • Fish
  • selenium disulfide
    • May
    • Forms
    • Used
    • Sulfur
    • Also
    • Dioxide
    • Many
    • Plants
    • Copper
    • Toxic
    • Animals
    • Fish
  • selenium hexafluoride
    • May
    • Forms
    • Used
    • Sulfur
    • Also
    • Dioxide
    • Many
    • Plants
    • Copper
    • Toxic
    • Animals
    • Fish
  • selenium tetrafluoride
    • May
    • Forms
    • Used
    • Sulfur
    • Also
    • Dioxide
    • Many
    • Plants
    • Copper
    • Toxic
    • Animals
    • Fish
  • selenium tetrachloride
    • May
    • Forms
    • Used
    • Sulfur
    • Also
    • Dioxide
    • Many
    • Plants
    • Copper
    • Toxic
    • Animals
    • Fish

Connections between topic areas Semantic bridges

For Selenium, one of the stronger structural bridges in this analysis connects Selenium with Chemical 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
SeleniumChemical compounds · splits 202 ⟂ 62
SeleniumBiological role · splits 213 ⟂ 51
SeleniumOverview · splits 232 ⟂ 32
SeleniumHistory · splits 235 ⟂ 29
SeleniumCharacteristics · splits 237 ⟂ 27
SeleniumApplications · splits 237 ⟂ 27
SeleniumPollution · splits 250 ⟂ 14
SeleniumProduction · splits 251 ⟂ 13
SeleniumOccurrence · splits 256 ⟂ 8

Map overview Semantic statistics

Selenium

Nodes264
Edges263
Triples289
Avg. degree1.99
Density0.007576
Components1

Source & methodology

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

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

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