Template:Infobox technetium

Technetium, ₄₃Tc

Technetium
Pronunciation	/tɛkˈniːʃiəm/ ​(tek-NEE-shee-əm)
Appearance	shiny gray metal
Mass number	[97]
Technetium in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson Mn ↑ Tc ↓ Re molybdenum ← technetium → ruthenium
Atomic number (Z)	43
Group	group 7
Period	period 5
Block	d-block
Element category	d-block
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
Heat of vaporization	585.2 kJ/mol
Molar heat capacity	24.27 J/(mol·K)
Vapor pressure (extrapolated) P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2727 2998 3324 3726 4234 4894
Atomic properties
Oxidation states	−3, −1, 0, +1, +2, +3, +4, +5, +6, +7 (a strongly acidic oxide)
Electronegativity	Pauling scale: 1.9
Ionization energies	1st: 702 kJ/mol 2nd: 1470 kJ/mol 3rd: 2850 kJ/mol
Atomic radius	empirical: 136 pm
Covalent radius	147±7 pm
Spectral lines of technetium
Other properties
Natural occurrence	from decay
Crystal structure	​hexagonal close-packed (hcp)
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
Iso­tope Abun­dance Physics:Half-life (t1/2) Decay mode Pro­duct 95mTc syn 61 d ε 95Mo γ – IT 95Tc 96Tc syn 4.3 d ε 96Mo γ – 97Tc syn 4.21×106 y ε 97Mo 97mTc syn 91 d IT 97Tc 98Tc syn 4.2×106 y β− 98Ru γ – 99Tc trace 2.111×105 y β− 99Ru 99mTc syn 6.01 h IT 99Tc γ –

Tc data m.p. cat
	in	calc from C	diff	report	ref
C	2157	—	—
K	2430	2430	0
F	3915	3915	0
max precision	0
WD
input	C: 2157, K: 2430, F: 3915
comment

Tc data b.p. cat
	in	calc from C	diff	report	ref
C	4265	—	—
K	4538	4538	0
F	7709	7709	0
max precision	0
WD
input	C: 4265, K: 4538, F: 7709
comment

PTChemistry:technetium

Mo ← i'box Mo	iso43Tc  infobox  isobox	→ Ru i'box Ru
Commons  Wikidata:Q1054  Wiktionary Indexes in PT: § below · Page

[]  Data sets read by {{Infobox element}}
Name and identifiers
Top image (caption, alt)
Pronunciation
Category (enwiki)
Standard atomic weight
most stable isotope
Natural occurrence
Phase at STP
Chemistry:Oxidation states
Spectral lines image
Physics:Electron configuration (cmt, ref)
Term symbol * (cmt, ref)
Wikidata *
* Not used in {{Infobox element}} (2019-02-03) See also {{Infobox element/symbol-to--navbox}}

References

These references will appear in the article, but this list appears only on this page.

Template:Documentation