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Technetium

Technetium is a chemical element; it has symbol Tc and atomic number 43. It is the lightest element whose isotopes are all radioactive. Technetium is one of only two radioactive elements both preceded and succeeded in the periodic table by elements with stable forms, the other being promethium. All available technetium is produced as a synthetic element.…

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95mTc
synth
96Tc
synth
97mTc
synth
97Tc
synth
98Tc
synth
99mTc
synth

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Overview

History

Characteristics

Compounds

Isotopes

Occurrence and production

Applications

Precautions and biological effect

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Map overview Semantic statistics

Technetium

Nodes255
Edges254
Triples240
Avg. degree1.99
Density0.007843
Components1

How this topic connects Entity context

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Technetium

Top relations

related to history · 24
Technetium → Berkeley, California, Carlo Perrier, Columbia University, Emilio Segrè, Ernest Lawrence, Glenn, Greek, He, In, Latin, Lawrence, Lawrence Berkeley National Laboratory, New York, Palermo, Panormus, Perrier, Seaborg, Segrè, Sicily
related to Irreproducible results · 21
Technetium → German, Henry Moseley, Ida Tacke, Later, Masuria, Nazis, Noddacks, Otto Berg, Paul Kuroda's, Poland, Prussia, Russian, Some, Still, The, This, Walter Noddack, Walter Noddack's, World War, X-ray
related to Fission product · 18
Technetium → An, Bq/kg, Cumbria, Discharge, European, For, From, In, Irish Sea, It, Its, Only, Other, Reprocessing, Sellafield, TBq, Technetium-99, The
related to Simple hydride and halide complexes · 17
Technetium → At, II, ReH2, Tc, TcBr3, TcBr4, TcCl2, TcCl3, TcCl4, TcF5, TcF6, TcH1, TcH2, TcI3, The, These, VI
related to Industrial and chemical · 11
Technetium → For, However, In, It, Like, Moreover, National Institute, NIST, Standards, Technetium-99, Technology
related to Coordination and organometallic complexes · 10
Technetium → CO, H2O, In, Interest, Many, Prominent, Similar, Tc, Tc2, The
related to Waste disposal · 9
Technetium → An, By, CERN, Current, Hence, If, In, Many, The
related to Chemical properties · 8
Technetium → As, Metallic, Of, Tc6C, TcH1, This, Unlike, When
related to Other chalcogenide derivatives · 8
Technetium → An, However, It, Similarly, Tc2O7, Tc2S7, TcO3, Unlike
related to Pertechnetate and other derivatives · 7
Technetium → MnO, Na, Pertechnetate, TcO, TcO4, The, Unlike

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Important terminology

element technetium-99 nuclear radioactive produced technetium-99m metal isotopes pertechnetate fission half-life tc used isotope one two elements table uranium molybdenum

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Technetium95mTcsynth1.00infobox
Technetium96Tcsynth1.00infobox
Technetium97mTcsynth1.00infobox
Technetium97Tcsynth1.00infobox
Technetium98Tcsynth1.00infobox
Technetium99mTcsynth1.00infobox
Technetium99Tctrace1.00infobox
TechnetiumAppearanceshiny gray metal1.00infobox
Technetiumat T (K)27271.00infobox
TechnetiumAtomic number (Z)431.00infobox
TechnetiumAtomic radiusempirical: 136 pm1.00infobox
TechnetiumBlockd-block1.00infobox
TechnetiumBoiling point4538 K ​(4265 °C, ​7709 °F)1.00infobox
TechnetiumCAS Number7440-26-81.00infobox
TechnetiumCovalent radius147±7 pm1.00infobox
TechnetiumCrystal structure​hexagonal close-packed (hcp) (hP2)1.00infobox
TechnetiumDensity (at 20° C)98Tc: 11.359 g/cm3 99Tc: 11.475 g/cm31.00infobox
TechnetiumDiscovery and first isolationCarlo Perrier and Emilio Segrè (1937)1.00infobox
TechnetiumElectrical resistivity200 nΩ⋅m (at 20 °C)1.00infobox
TechnetiumElectron configuration[Kr] 4d5 5s21.00infobox
TechnetiumElectronegativityPauling scale: 1.91.00infobox
TechnetiumElectrons per shell2, 8, 18, 13, 21.00infobox
TechnetiumGroupgroup 71.00infobox
TechnetiumHeat of fusion33.29 kJ/mol1.00infobox
TechnetiumHeat of vaporization585.2 kJ/mol1.00infobox
TechnetiumIonization energies1st: 686.9 kJ/mol1.00infobox
TechnetiumIonization energies2nd: 1470 kJ/mol1.00infobox
TechnetiumIonization energies3rd: 2850 kJ/mol1.00infobox
TechnetiumLattice constantsa = 274.12 pm c = 439.90 pm (at 20 °C)1.00infobox
TechnetiumMagnetic orderingParamagnetic1.00infobox

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