Teknesyo

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Technetium
43Tc
Mn

Tc

Re
molybdenumtechnetiumruthenium
Appearance
shiny gray metal
250px
General properties
Name, simbolo, kaiphan technetium, Tc, 43
Pronunciation Plantilya:IPAc-en
Plantilya:Respell
Element category puthaw nga transisyon
Group, period, block 75, d
Standard atomic weight [98]
Electron configuration [Kr] 4d5 5s2
2, 8, 18, 13, 2
Electron shells of technetium (2, 8, 18, 13, 2)
History
Prediction Dmitri Mendeleev (1871)
Discovery Carlo Perrier and Emilio Segrè (1937)
First isolation Carlo Perrier and Emilio Segrè (1937)
Physical properties
Phase magahi
Density (near r.t.) 11 g·cm−3
Melting point 2430 K, 2157 °C, 3915 °F
Boiling point 4538 K, 4265 °C, 7709 °F
Heat of fusion 33.29 kJ·mol−1
Heat of vaporization 585.2 kJ·mol−1
Molar heat capacity 24.27 J·mol−1·K−1
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 7, 6, 5, 4, 3[1], 2, 1[2], -1, -3
(strongly acidic oxide)
Electronegativity 1.9 (Pauling scale)
Ionization energies 1st: 702 kJ·mol−1
2nd: 1470 kJ·mol−1
3rd: 2850 kJ·mol−1
Atomic radius 136 pm
Covalent radius 147±7 pm
Miscellanea
Crystal structure hexagonal
Technetium has a hexagonal crystal structure
Magnetic ordering Paramagnetic
Thermal conductivity 50.6 W·m−1·K−1
Speed of sound (thin rod) (20 °C) 16,200 m·s−1
CAS registry number 7440-26-8
Most stable isotopes
Main article: Isotopes of technetium
iso NA half-life DM DE (MeV) DP
95mTc syn 61 d ε - 95Mo
γ 0.204, 0.582,
0.835
-
IT 0.0389, e 95Tc
96Tc syn 4.3 d ε - 96Mo
γ 0.778, 0.849,
0.812
-
97Tc syn 2.6×106 y ε - 97Mo
97mTc syn 91 d IT 0.965, e 97Tc
98Tc syn 4.2×106 y β 0.4 98Ru
γ 0.745, 0.652 -
99Tc trace 2.111×105 y β 0.294 99Ru
99mTc syn 6.01 h IT 0.142, 0.002 99Tc
γ 0.140 -
t  h  u
· r

Ang teknesyo (Iningles technetium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Tc ug kaiphan nga atomik 43. Ang teknesyo mao ang puthaw nga transisyon.

Ang mga gi basihan niini[usba | edit source]

  1. Technetium: technetium(III) iodide compound data. OpenMOPAC.net. Retrieved on 2007-12-10.
  2. Technetium: technetium(I) fluoride compound data. OpenMOPAC.net. Retrieved on 2007-12-10.


Galeriya sa hulagway[usba | edit source]