Technécium
43
Tc
Csoport
7
Periódus
5
Mező
d
Protonok
Elektronok
Neutronok
43
43
55
Általános Tulajdonságok
Rendszám
43
Atomtömeg
[98]
Tömegszám
98
Kategória
Átmeneti fémek
Szín
Ezüst
Radioaktivitás
Igen
A görög technetos, mesterséges szóból
Kristályrácstípus
Hexagonális
Története
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.
Elektronok száma héjanként
2, 8, 18, 13, 2
Elektronkonfiguráció
[Kr] 4d5 5s2
A technécium volt az első mesterségesen előállított elem
Fizikai Tulajdonságok
Halmazállapot
Szilárd
Sűrűség
11,5 g/cm3
Olvadáspont
2430,15 K | 2157 °C | 3914,6 °F
Forráspont
4538,15 K | 4265 °C | 7709 °F
Olvadáshő
23 kJ/mol
Párolgáshő
550 kJ/mol
Fajlagos hőkapacitás
-
Gyakoriság a Földön
n/a
Gyakoriság az Univerzumban
n/a
CAS-szám
7440-26-8
PubChem CID azonosító
n/a
Atomi Tulajdonságok
Atomsugár
136 pm
Kovalenssugár
147 pm
Elektronegativitás
1,9 (Pauling skálán)
Ionizációs energia
7,28 eV
Atomtérfogat
8,5 cm3/mol
Hővezetési tényező
0,506 W/cm·K
Oxidációs állapotok
-3, -1, 1, 2, 3, 4, 5, 6, 7
Felhasználás
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.
A technécium radioaktivitása miatt ártalmas
Izotópok
Stabil izotópok
-Instabil izotópok
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