technetium

Also known as 43Tc, Tc, element 43, masurium, panormium, eka-manganese

Technetium is a chemical element; it has symbol Tc and atomic number 43. It is the lightest element whose isotopes are all radioactive. Technetium and promethium are the only radioactive elements whose neighbours in the sense of atomic number are both stable. All available technetium is produced as a synthetic element. Naturally occurring technetium is a spontaneous fission product in uranium ore and thorium ore (the most common source), or the product of neutron capture in molybdenum ores. This silvery gray, crystalline transition metal lies between manganese and rhenium in group 7 of th

OverviewAI-generated

Technetium is a chemical element with the symbol Tc and atomic number 43. It has an electronegativity of 1.9 and an ionic radius of 0.65. The element’s electron configuration is [Kr] 4d⁵ 5s², and it exhibits an oxidation state of 7. Its melting point is 2170.

The canonical SMILES representation is [Tc], and its chemical formula is Tc. The Unicode character for technetium is 鎝. The PubChem identifier is 23957, and the IUPAC name is technetium. The molecular weight is 96.90636, while another listed mass is 97.907. The compound has zero hydrogen bond donors and acceptors, with a topological polar surface area of 0.

Technetium was discovered in 1937. It is referenced by 732 other encyclopedia articles. PubMed records 53,611 entries related to the query technetium.

Synthesized by Vinony from 26 facts across 4 sources: Wikidata, PubChem, PubMed, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.

Chemical data

Formula: Tc
Molecular weight: 96.90636 g/mol
IUPAC name: technetium
SMILES: [Tc]
InChIKey: GKLVYJBZJHMRIY-UHFFFAOYSA-N
Polar surface area: 0 Å²
H-bond donors: 0
H-bond acceptors: 0
Formal charge: 0

via PubChem

Research

53,611 papers

Technetium, the missing element.ReviewEuropean journal of nuclear medicine · 1996de Jonge FA, Pauwels EKDOI: 10.1007/BF00837634
Technetium Complexes and Radiopharmaceuticals with Scorpionate Ligands.ReviewMolecules (Basel, Switzerland) · 2018Martini P, Pasquali M, Boschi A et al.DOI: 10.3390/molecules23082039
[Technetium Tc43 99m].ReviewLa Presse medicale · 1967Pizon P
Addressing Technetium-99m Shortage.Journal of the American College of Radiology : JACR · 2017Mahesh M, Madsen MDOI: 10.1016/j.jacr.2017.02.007
Radiotracers based on technetium-94m.ReviewCurrent radiopharmaceuticals · 2011Gagnon K, McQuarrie S, Abrams D et al.DOI: 10.2174/1874471011104020090
Indocyanine green fluorescence versus blue dye, technetium-99M, and the dual-marker combination of technetium-99M + blue dye for sentinel lymph node detection in early breast cancer-meta-analysis including consistency analysis.ReviewSurgery · 2024White KP, Sinagra D, Dip F et al.DOI: 10.1016/j.surg.2023.10.021
Technetium and gallium derived radiopharmaceuticals: comparing and contrasting the chemistry of two important radiometals for the molecular imaging era.ReviewChemical reviews · 2010Bartholomä MD, Louie AS, Valliant JF et al.DOI: 10.1021/cr1000755
Straightening out the wrinkles in technetium-99m-labeled bone scintigraphy tracer assessment of cardiac amyloidosis.Journal of nuclear cardiology : official publication of the American Society of Nuclear Cardiology · 2021Small GR, Ruddy TDDOI: 10.1007/s12350-019-01718-8

via PubMed

~32 min read

Encyclopedic overview

29 sections

Contents

History
Early assumptions
Early misidentifications
Irreproducible results
Official discovery and later history
Characteristics
Physical properties
Chemical properties
Compounds
Pertechnetate and other derivatives
Other chalcogenide derivatives
Simple hydride and halide complexes
Coordination and organometallic complexes
Isotopes
Occurrence and production
Fission product
Fission product for commercial use
Waste disposal
Neutron activation
Particle accelerators
Applications
Nuclear medicine and biology
Industrial and chemical
Precautions and biological effect
Notes
References
Bibliography
Further reading
External links

Many of technetium's properties had been predicted by Dmitri Mendeleev before it was discovered; Mendeleev noted a gap in his periodic table and gave the undiscovered element the provisional name ekamanganese (Em). In 1937, technetium became the first predominantly artificial element to be produced, hence its name (from the Greek '''', 'artificial', +

Excerpted from Wikipedia’s “technetium” article, available under the CC BY-SA 4.0 licence.