Tabla

Electronic ConfigurationKr 5s2 4d5

Melting Point2172°C

Boiling Point4877°C

Density11.5g cm⁻³

Description

Radioactive metallic transition element. Can be detected in some stars and the fission products of Uranium. First made by Perrier and Segre by bombarding Molybdenum with deutrons, giving them ⁹⁷Tc. ⁹⁹Tc is the most stable isotope with a half-life of 2.6*10^6 years. Sixteen isotopes are known. Organic Technetium compounds are used in bone imaging. Chemical properties are intermediate between Rhenium and Manganese.

Covalent Radius128pm

Double120pm

Triple110pm

Ionisation Energies

Oxidation States0, +4, +6, +7

Uses

Added to Iron in quantities as low as 55 part-per-million transforms the Iron into a corrosion-resistant alloy.

Electron Affinity53.067kJ mol⁻¹

Electronegativity2.1PAULING

Atomic Volume8.5cm³ mol⁻¹

Atomic Radius136pm

Metallic Radius127pm

Van Der Waals Radius216pm

Sources

Made first by bombarding Molybdenum with deuterons (heavy Hydrogen) in a cyclotron.

Discovery

Discovered in 1937 by Carlo Perrier, Émillo Segrè in Italy

Name Origin

Greek: technêtos (artificial).

CAS7440-26-8

Enthalpy of Vapourisation 585kJ mol⁻¹

Enthalpy of Fusion23.8kJ mol⁻¹

Enthalpy of Formation678kJ mol⁻¹

Specific Heat - 20°C0.243J (g ⋅ K)⁻¹

Thermal Conductivity50.6W (m ⋅ K)⁻¹

Isotope	Abundance	Half Life
98Tc	-	4.200x10⁶y
97Tc	-	4.210x10⁶a
99Tc	-	2.111x10⁵a

https://reuben.science

https://github.com/reubn/tabla

Using data from mendeleev.

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