ଛାଞ୍ଚ:Infobox Technetium

Technetium,  ₄₃Tc

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	technetium, Tc
Appearance	shiny gray metal
ଉଚ୍ଚାରଣ	/tɛkˈniːʃiəm/ tek-NEE-shee-əm
Technetium in the periodic table
Mn ↑ Tc ↓ Re molybdenum ← technetium → ruthenium
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	43
ଶ୍ରେଣୀ, ବ୍ଳକ	group 7, d-block
ପର୍ଯ୍ୟାୟ	period 5
ମୌଳିକ ପ୍ରକାର	transition metal
ମାନକ ପରମାଣବିକ ଓଜନ (Ar)	[98]
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Kr] 4d5 5s2
per shell	2, 8, 18, 13, 2
ଭୌତିକ ଗୁଣ
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	2430 K ​(2157 °C, ​3915 °F)
ସ୍ଫୁଟନାଙ୍କ	4538 K ​(4265 °C, ​7709 °F)
Density near r.t.	11 g/cm3
Heat of fusion	33.29 kJ/mol
Heat of	585.2 kJ/mol
Molar heat capacity	24.27 J/(mol·K)
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, 2, 1, -1, -3 ​strongly acidic oxide
Electronegativity	Pauling scale: 1.9
Atomic radius	empirical: 136 pm
Covalent radius	147±7 pm
Miscellanea
Crystal structure	​hexagonal close-packed (hcp)
Speed of sound thin rod	16,200 m/s (at 20 °C)
Thermal conductivity	50.6 W/(m·K)
Magnetic ordering	Paramagnetic
CAS Number	7440-26-8
ଇତିହାସ
Prediction	Dmitri Mendeleev (1871)
ଆବିଷ୍କାର	Carlo Perrier and Emilio Segrè (1937)
First isolation	Carlo Perrier and Emilio Segrè (1937)
Most stable 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 -

References

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