Technetium

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Technetium
43Tc
Mn

Tc

Re
molybdenumtechnetiumruthenium
Ìhànsójú
Shiny gray metal
250px
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà technetium, Tc, 43
Ìpèlóhùn /tɛkˈniːʃiəm/
tek-NEE-shee-əm
Ẹ̀ka ẹ́límẹ̀nti transition metal
Ẹgbẹ́, àsìkò, àdìpò 75, d
Ìwúwo átọ́mù 98(0)
Ìtòléra ẹ̀lẹ́ktrónì Kr 4d5 5s2
2, 8, 18, 13, 2
Physical properties
Phase solid
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
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù 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 -
· r


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