Template:Infobox technetium

Technetium,  ₄₃Tc

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General properties
Pronunciation	Template:Infobox element/pronunciation
Appearance	shiny gray metal
Standard atomic weight (Ar, standard)	Template:Infobox element/standard atomic weight
Mass number	Template:Infobox element/symbol-to-most-stable-isotope (most stable isotope)
Technetium in the periodic table
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Atomic number (Z)	43
Group	Template:Infobox element/group
Period	period 5
Block	d-block
Element category	Template:Infobox element/category format
Electron configuration	[Kr] 4d5 5s2
Electrons per shell	2, 8, 18, 13, 2
Physical properties
Phase at STP	solid
Melting point	2430 K ​(2157 °C, ​3915 °F)
Boiling point	4538 K ​(4265 °C, ​7709 °F)
Density (near r.t.)	11 g/cm3
Heat of fusion	33.29 kJ/mol
[[Enthalpy of vaporization|Heat of Template:Engvar]]	585.2 kJ/mol
Molar heat capacity	24.27 J/(mol·K)
[[Vapor pressure|Template:Engvar pressure]] (extrapolated) Template:Infobox element/vapor pressure table
Atomic properties
Oxidation states	Template:Infobox element/symbol-to-oxidation-state
Electronegativity	Pauling scale: 1.9
[[Ionization energy|Template:Engvar energies]]	1st: 702 kJ/mol 2nd: 1470 kJ/mol 3rd: 2850 kJ/mol
Atomic radius	empirical: 136 pm
Covalent radius	147±7 pm
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Other properties
Crystal structure	​Template:Infobox element/crystal structure Template:Infobox element/crystal structure
Speed of sound thin rod	16,200 m/s (at 20 °C)
Thermal expansion	7.1 µm/(m·K) (at r.t.)
Thermal conductivity	50.6 W/(m·K)
Electrical resistivity	200 nΩ·m (at 20 °C)
Magnetic ordering	Paramagnetic
Magnetic susceptibility	+270.0·10−6 cm3/mol (298 K)
CAS Number	7440-26-8
History
Prediction	Dmitri Mendeleev (1871)
Discovery and first isolation	Emilio Segrè and Carlo Perrier (1937)
Main isotopes of technetium
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