Technetium
43
Tc
Gruppe
7
Periode
5
Blokk
d
Proton
Elektron
Nøytron
43
43
55
Generelle eigenskapar
Atomnummer
43
Atommasse
[98]
Massetal
98
Kategori
Transisjonsmetall
Farge
Sølv
Radioaktiv
Ja
From the Greek word technetos, artificial
Krystallstruktur
Enkel heksagonal
Historie
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.
Elektron per energinivå
2, 8, 18, 13, 2
Elektronkonfigurasjon
[Kr] 4d5 5s2
Technetium was the first element to be produced artificially
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
11,5 g/cm3
Smeltepunkt
2430,15 K | 2157 °C | 3914,6 °F
Kokepunkt
4538,15 K | 4265 °C | 7709 °F
Smeltevarme
23 kJ/mol
Fordampingsvarme
550 kJ/mol
Spesifikk varmekapasitet
- J/g·K
Førekomst i jordskorpa
i/t
Førekomst i universet
i/t
CAS-nummer
7440-26-8
PubChem CID-nummer
i/t
Atom eigenskapar
Atomradius
136 pm
Kovalent radius
147 pm
Elektronegativitet
1,9 (Paulings skala)
Ioniseringspotensial
7,28 eV
Molart volum
8,5 cm3/mol
Termisk konduktivitet
0,506 W/cm·K
Oksidasjonstrinn
-3, -1, 1, 2, 3, 4, 5, 6, 7
Bruksområde
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
Isotopar
Stabile isotopar
-Ustabile isotopar
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