Technetium
43
Tc
Gruppe
7
Periode
5
Blok
d
Protoner
Elektroner
Neutroner
43
43
55
Generelle Egenskaber
Atomnummer
43
Atommasse
[98]
Masseantal
98
Kategori
Overgangsmetaller
Farve
Sølv
Radioaktiv
Ja
From the Greek word technetos, artificial
Krystalstruktur
Simpel Hexagonal
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.
Elektroner i hver skal
2, 8, 18, 13, 2
Elektronkonfiguration
[Kr] 4d5 5s2
Technetium was the first element to be produced artificially
Fysiske Egenskaber
Tilstandsform
Fast stof
Massefylde
11,5 g/cm3
Smeltepunkt
2430,15 K | 2157 °C | 3914,6 °F
Kogepunkt
4538,15 K | 4265 °C | 7709 °F
Smeltevarme
23 kJ/mol
Fordampningsvarme
550 kJ/mol
Varmefylde
-
Forekomst i jordskorpen
n/a
Forekomst i universet
n/a
CAS-nummer
7440-26-8
PubChem CID-nummer
n/a
Atomare egenskaber
Atomradius
136 pm
Kovalent radius
147 pm
Elektronegativitet
1,9 (Paulings skala)
Ioniseringspotentiale
7,28 eV
Atomvolumen
8,5 cm3/mol
Varmeledningsevne
0,506 W/cm·K
Oxidationstrin
-3, -1, 1, 2, 3, 4, 5, 6, 7
Anvendelser
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
Isotoper
Stabile isotoper
-Ustabile isotoper
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