Teknesyo

Technetium
43Tc
Mn ↑ Tc ↓ Re Periodic table molybdenum ← technetium → ruthenium
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	7, 5, d
Standard atomic weight	[98]
Electron configuration	[Kr] 4d5 5s2 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, 2, 1, -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
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 -

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.

Galeriya sa hulagway

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