Template:Infobox technetium

Technetium, ₄₃Tc

Technetium
Pronunciation	/tɛkˈniːʃiəm/ ​(tek-NEE-shee-əm)
Mass number	[97]
Technetium in the periodic cairt
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 Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) 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 Gowd Mercur (element) Thallium Leid (element) 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 Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium Mn ↑ Tc ↓ Re molybdenum ← technetium → ruthenium
Atomic nummer (Z)	43
Group	group 7
Period	period 5
Block	d-block
Element category	Transeetion metal
Electron confeeguration	[Kr] 4d5 5s2
Electrons per shell	2, 8, 18, 13, 2
Pheesical properties
Phase at STP	solit
Meltin pynt	2430 K ​(2157 °C, ​3915 °F)
Bylin pynt	4538 K ​(4265 °C, ​7709 °F)
Density (near r.t.)	11 g/cm3
Heat o fusion	33.29 kJ/mol
Heat o vapourisation	585.2 kJ/mol
Molar heat capacity	24.27 J/(mol·K)
Vapour pressur (extrapolatit) 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 strangly acidic
Electronegativity	Pauling scale: 1.9
Atomic radius	empirical: 136 pm
Covalent radius	147±7 pm
Colour lines in a spectral range Spectral lines o technetium
Ither properties
Creestal structur	​hexagonal close-packed (hcp)
Speed o soond thin rod	16,200 m/s (at 20 °C)
Thermal conductivity	50.6 W/(m·K)
Magnetic orderin	Paramagnetic
CAS Nummer	7440-26-8
History
Prediction	Dmitri Mendeleev (1871)
Diskivery	Carlo Perrier an Emilio Segrè (1937)
First isolation	Carlo Perrier an Emilio Segrè (1937)
Main isotopes o technetium
Iso­tope Abun­dance Hauf-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 2.6×106 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 -

style="text-align:left"| data m.p. cat
	in	calc from C	diff	report	ref
C	2157	—	—
K	2430	2430	0
F	3915	3915	0
WD	2170 !2170 Celsius
input	C: 2157, K: 2430, F: 3915
comment

style="text-align:left"| data b.p. cat
	in	calc from C	diff	report	ref
C	4265	—	—
K	4538	4538	0
F	7709	7709	0
WD	!
input	C: 4265, K: 4538, F: 7709
comment

References

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