Electronic data		Thermal data		Steric data
Shells: 2,8,18,13,2 Orbitals: [Kr] 4d5 5s2 Electronegativity: 1.4, 1.9 1. Ionization potential: 7.28 eV 2. Ionization potential: 15.26 eV 3. Ionization potential: 29.54 eV Oxidation states: 7 Electrical conductivity: 0.067 10^6		Melting point: 2172 °C Boiling point: 4877 °C Specific heat: 0.21 J/gK Heat of fusion: 24.0 kJ/mol Heat of vaporization: 660.0 kJ/mol Thermal conductivity: 0.506 W/cmK		Atomic radius: 1.95 Å Ionic radius: -- Å () Covalent radius: 1.27 Å Atomic volume: 8.5 cm³/mol Density (293 K): 11.5 g/cm³ Crystal structure: Hexagonal

Nuclide	Abundance [%]	Mass	Spin	Halflife	Decay mode	Decay tree
95Tc	0	95	9/2	20.0h	EC	View
95Tcm	0	95	1/2	61.0d	EC,IT	View
96Tc	0	96	7	4.28d	EC	View
96Tcm	0	96	4	51.5m	IT,EC,+	View
97Tc	0	97	9/2	2.6E06y	EC	View
97Tcm	0	97	1/2	90.0d	IT	View
98Tc	0	97.9072	6	4.2E06y	-	View
99Tc	0	98.908	9/2	2.13E05y	-	View
99Tcm	0	97	1/2	6.01h	IT,-	View
101Tc	0	101	9	14.2m	-	View

Legend

Name origin:	Greek: technêtos (artificial)
Description:	Silvery-gray metal. First synthetically produced element.
Discovered by:	Carlo Perrier, émillo Segrè
Year:	1937
Place:	Italy
Sources:	Made first by bombarding molybdenum with deuterons (heavy hydrogen) in a cyclotron.
Use(s):	Added to iron in quantities as low as 55 part-per-million transforms the iron into a corrosion- resistant alloy.