Tehnecij
43
Tc
Skupina
7
Perioda
5
Blok
d
Protoni
Elektroni
Nevtroni
43
43
55
Splošne lastnosti
Vrstno število
43
Atomska teža
[98]
Masno število
98
Kategorija
Prehodne kovine
Barva
Srebrna
Radioaktivno
Da
From the Greek word technetos, artificial
Kristalna struktura
Heksagonalna
Zgodovina
Element 43 was predicted on the basis of the periodic table, and was erroneously reported as having been discovered in 1925, at which time it was named masurium.
The element was actually discovered by Carlo Perrier and Emilio Segrè in 1937.
It was also found in a sample of molybdenum sent by Ernest Lawrence that was bombarded by deuterons in the Berkeley cyclotron.
The element was actually discovered by Carlo Perrier and Emilio Segrè in 1937.
It was also found in a sample of molybdenum sent by Ernest Lawrence that was bombarded by deuterons in the Berkeley cyclotron.
Elektroni po lupinah
2, 8, 18, 13, 2
Razporeditev elektronov
[Kr] 4d5 5s2
Technetium was the first element to be produced artificially
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
11,5 g/cm3
Tališče
2430,15 K | 2157 °C | 3914,6 °F
Vrelišče
4538,15 K | 4265 °C | 7709 °F
Talilna toplota
23 kJ/mol
Izparilna toplota
550 kJ/mol
Toplotna kapaciteta
- J/g·K
Zastopanost v Zemljini skorji
n/p
Zastopanost v vesolju
n/p
CAS številka
7440-26-8
PubChem CID številka
n/p
Atomske lastnosti
Atomski polmer
136 pm
Kovalentni polmer
147 pm
Elektronegativnost
1,9 (Paulingova lestvica)
Ionizacijski potencial
7,28 eV
Atomski volumen
8,5 cm3/mol
Toplotna prevodnost
0,506 W/cm·K
Oksidacijska stanja
-3, -1, 1, 2, 3, 4, 5, 6, 7
Uporabe
Technetium is used in nuclear medicine to carry out a number of medical tests, mainly relating to imaging and functional studies of internal bodily organs like bone scan.
It is also used industrially for equipment calibration following its approval as a standard beta emitter.
Mild carbon steels may be effectively protected by minute quantities of technetium, but this corrosion protection is limited to closed systems because of technetium's radioactivity.
It is also used industrially for equipment calibration following its approval as a standard beta emitter.
Mild carbon steels may be effectively protected by minute quantities of technetium, but this corrosion protection is limited to closed systems because of technetium's radioactivity.
Technetium is harmful due to its radioactivity
Izotopi
Stabilni izotopi
-Nestabilni izotopi
85Tc, 86Tc, 87Tc, 88Tc, 89Tc, 90Tc, 91Tc, 92Tc, 93Tc, 94Tc, 95Tc, 96Tc, 97Tc, 98Tc, 99Tc, 100Tc, 101Tc, 102Tc, 103Tc, 104Tc, 105Tc, 106Tc, 107Tc, 108Tc, 109Tc, 110Tc, 111Tc, 112Tc, 113Tc, 114Tc, 115Tc, 116Tc, 117Tc, 118Tc