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 .
Quick Facts Technetium, Panagway ...
Technetium
43
Panagway
shiny gray metalThin gray sheet of metal, with a dull shine, encased in a glass tube
Kinatibuk-ang mga kinaiya
Ngalan, simbolo , kaiphan
technetium, Tc, 43
Paglitok
[[Help:Pronunciation respelling key|tek-Plantilya:Smallcaps all ]]
Kategoriyang elemento puthaw nga transisyon
Group , period , block 7 , 5 , d
Gibug-aton sa atomo [98]
Kontorno sa elektron [Kr ] 4d5 5s2 Electron shells of technetium (2, 8, 18, 13, 2)
History
Prediction
Dmitri Mendeleev (1871)
Pagkadiskobre 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] 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
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
95m Tcsyn 61 d ε -
95 Mo
γ 0.204, 0.582,
IT 0.0389, e
95 Tc
96 Tcsyn 4.3 dε
-
96 Mo
γ
0.778, 0.849,
97 Tcsyn 2.6×106 y ε
-
97 Mo
97m Tcsyn 91 dIT
0.965, e
97 Tc
98 Tcsyn 4.2×106 yβ− 0.4
98 Ru
γ
0.745, 0.652
99 Tctrace 2.111×105 yβ−
0.294
99 Ru
99m Tcsyn 6.01 h IT
0.142, 0.002
99 Tc
γ
0.140
· r
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