Teknetium
43
Tc
Grupp
7
Period
5
Block
d
Protoner
Elektroner
Neutroner
43
43
55
Generella Egenskaper
Atomnummer
43
Atommassa
[98]
Masstal
98
Kategori
Övergångsmetaller
Färg
Silver
Radioaktiv
Ja
From the Greek word technetos, artificial
Kristallstruktur
Enkelt hexagonalt
Historia
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 per skal
2, 8, 18, 13, 2
Elektronkonfiguration
[Kr] 4d5 5s2
Technetium was the first element to be produced artificially
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
11,5 g/cm3
Smältpunkt
2430,15 K | 2157 °C | 3914,6 °F
Kokpunkt
4538,15 K | 4265 °C | 7709 °F
Smältvärme
23 kJ/mol
Ångbildningsvärme
550 kJ/mol
Specifik värmekapacitet
-
Förekomst i jordskorpan
Ej tillämplig
Förekomst i universum
Ej tillämplig
CAS-nummer
7440-26-8
PubChem CID-nummer
Ej tillämplig
Atomära Egenskaper
Atomradie
136 pm
Kovalent radie
147 pm
Elektronegativitet
1,9 (Paulingskalan)
Jonisationspotential
7,28 eV
Molvolym
8,5 cm3/mol
Värmeledningsförmåga
0,506 W/cm·K
Oxidationstillstånd
-3, -1, 1, 2, 3, 4, 5, 6, 7
Användningsområden
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
Stabila isotoper
-Instabila 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