Teknisyo

Technetium, ₄₃Tc
Technetium
Pronunciation	/tɛkˈniːʃ(i)əm/ (tek-NEE-sh(ee-)əm)
Appearance	shiny gray metal
Mass number	[97] (data not decisive)
Technetium in the periodic table
	molybdenum ← technetium → ruthenium
Atomic number (Z)	43
Group	7
Period	5
Block	d-block
Electron configuration	[Kr] 4d5 5s2
Electrons per shell	2, 8, 18, 13, 2
Physical properties
Phase at STP	solido
Melting point	2430 K (2157 °C, 3915 °F)
Boiling point	4538 K (4265 °C, 7709 °F)
Density (at 20° C)	98Tc: 11.359 g/cm3; 99Tc: 11.475 g/cm3
Heat of fusion	33.29 kJ/mol
Heat of vaporization	585.2 kJ/mol
Molar heat capacity	24.27 J/(mol·K)
Atomic properties
Oxidation states	−3, −1, 0, +1, +2, +3, +4, +5, +6, +7 (isang matapang na asidikong oksido)
Electronegativity	Pauling scale: 1.9
Ionization energies	1st: 686.9 kJ/mol ; 2nd: 1470 kJ/mol ; 3rd: 2850 kJ/mol ; ;
Atomic radius	empirical: 136 pm
Covalent radius	147±7 pm
Van der Waals radius	205 pm
	Mga linyang espektral ng technetium
Other properties
Crystal structure	hexagonal close-packed (hcp) (hP2)
Lattice constants	a = 274.12 pm; c = 439.90 pm (at 20 °C)
Thermal expansion	8.175×10−6/K (at 20 °C)
Thermal conductivity	50.6 W/(m⋅K)
Electrical resistivity	200 nΩ⋅m (at 20 °C)
Magnetic ordering	Paramagnetic
Molar magnetic susceptibility	+270.0×10−6 cm3/mol (298 K)
Speed of sound thin rod	16,200 m/s (at 20 °C)
CAS Number	7440-26-8
History
Prediction	Dmitri Mendeleev (1871)
Discovery and first isolation	Emilio Segrè and Carlo Perrier (1937)
Isotopes of technetium t; b;
IT	95Tc
γ	–
ε	...
β+	–
β−	–
	Kategorya: Technetium; tingnan; usapan; baguhin; \| references

Ang technetium ( /tɛkˈniːʃiəm/) ay isang kemikal na elemento na may simbolong Tc at atomikong bilang na 43.

Ang lathalaing ito ay isang usbong. Makatutulong ka sa Wikipedia sa pagpapalawig nito.

Pasilip ng sanggunian

↑ ^1.0 ^1.1 Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.{cite journal}: CS1 maint: date auto-translated (link)
↑ ^2.0 ^2.1 ^2.2 Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.{cite book}: CS1 maint: date auto-translated (link)
↑ ^3.0 ^3.1 "Technetium: technetium(III) iodide compound data" (sa wikang Ingles). OpenMOPAC.net. Nakuha noong 2007-12-10.{cite web}: CS1 maint: date auto-translated (link)
↑ Mattolat, C.; Gottwald, T.; Raeder, S.; Rothe, S.; Schwellnus, F.; Wendt, K.; Thörle-Pospiech, P.; Trautmann, N. (24 Mayo 2010). "Determination of the first ionization potential of technetium". Physical Review A. 81: 052513. doi:10.1103/PhysRevA.81.052513.{cite journal}: CS1 maint: date auto-translated (link)
↑ Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.{cite book}: CS1 maint: date auto-translated (link)

↑ The most stable isotope of technetium cannot be determined based on existing data due to overlapping measurement uncertainties for the half-lives of the two longest-lived isotopes. The half-life of ⁹⁷Tc with an uncertainty corresponding to one standard deviation is 4.21±0.16 million years, while that for ⁹⁸Tc is 4.2±0.3 million years; these measurements have overlapping confidence intervals.^[1]

[NUBASE2020-1] 1.0 ^1.1 Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.{cite journal}: CS1 maint: date auto-translated (link)

[Arblaster_2018-3] 2.0 ^2.1 ^2.2 Arblaster, John W. (2018). Selected Values of the Crystallographic Properties of Elements. Materials Park, Ohio: ASM International. ISBN 978-1-62708-155-9.{cite book}: CS1 maint: date auto-translated (link)

[OpenMOPAC-4] 3.0 ^3.1 "Technetium: technetium(III) iodide compound data" (sa wikang Ingles). OpenMOPAC.net. Nakuha noong 2007-12-10.{cite web}: CS1 maint: date auto-translated (link)

[5] Mattolat, C.; Gottwald, T.; Raeder, S.; Rothe, S.; Schwellnus, F.; Wendt, K.; Thörle-Pospiech, P.; Trautmann, N. (24 Mayo 2010). "Determination of the first ionization potential of technetium". Physical Review A. 81: 052513. doi:10.1103/PhysRevA.81.052513.{cite journal}: CS1 maint: date auto-translated (link)

[6] Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.{cite book}: CS1 maint: date auto-translated (link)

[most_stable_isotope-2] The most stable isotope of technetium cannot be determined based on existing data due to overlapping measurement uncertainties for the half-lives of the two longest-lived isotopes. The half-life of ⁹⁷Tc with an uncertainty corresponding to one standard deviation is 4.21±0.16 million years, while that for ⁹⁸Tc is 4.2±0.3 million years; these measurements have overlapping confidence intervals.^[1]

[a]

[2]

[3]

[4]

[5]

[1]