ټېکنېټيوم

Technetium, ₄₃Tc
	دوتنه:Technetium.jpg
عمومي خواص
Pronunciation	/tɛkˈniːʃiəm/ ; tek-NEE-shee-əm
Appearance	shiny gray metal
Technetium په دوراني جدول کې
molybdenum ← technetium → ruthenium	‍
اټومي شمیره (Z)	43
گروپ, پیریود	group 7, period 5
بلاک	d-block
Element category	transition metal
Mass number	98 (most stable isotope)
Electron configuration	[Kr] 4d5 5s2
Electrons per shell	2, 8, 18, 13, 2
فزیکي خواص
حالت (at STP)	جامد
دويلې کيدو ټکى	2430 K (2157 °C, 3915 °F)
يشنا ټکی	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)
اټومي خواص
Oxidation states	7, 6, 5, 4, 3, 2, 1, −1, −3 (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
Miscellanea
Crystal structure	hexagonal close-packed (hcp) Hexagonal close packed crystal structure for technetium
Speed of sound thin rod	16,200 m/s (at 20 °C)
Thermal expansion	7.1 µm/(m·K) (at r.t.)
د تودوخې تېرېدنه	50.6 W/(m·K)
Electrical resistivity	200 nΩ·m (at 20 °C)
Magnetic ordering	Paramagnetic
Magnetic susceptibility (χmol)	+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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ټېکنېټيوم (په انگرېزي: Technetium) له کیمیاوي عناصرو څخه یو دی چې په تناوبي جدول کې د Tc سمبول او ۴۳ اتمي شمېرې په وسیله ښودل شوی دی.

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د استعمال ځایونه

سرچينې

↑ ^۱٫۰ ^۱٫۱ "Technetium: technetium(III) iodide compound data". OpenMOPAC.net. بياځلي په 2007-12-10.
↑ Cverna, Fran (2002). "Ch. 2 Thermal Expansion". ASM Ready Reference: Thermal properties of metals (PDF). ASM International. ISBN 978-0-87170-768-0.
↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.

دا ليکنه نابشپړه ده، تاسې ددې ليکنې په بشپړولو کې د ويکيپېډيا سره مرسته کولای شئ.

[OpenMOPAC-1] ۱٫۰ ^۱٫۱ "Technetium: technetium(III) iodide compound data". OpenMOPAC.net. بياځلي په 2007-12-10.

[2] Cverna, Fran (2002). "Ch. 2 Thermal Expansion". ASM Ready Reference: Thermal properties of metals (PDF). ASM International. ISBN 978-0-87170-768-0.

[3] Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.

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