Technetium
43
Tc
Groep
7
Periode
5
Blok
d
Protonen
Elektronen
Neutronen
43
43
55
Algemene Eigenschappen
Atoomnummer
43
Atomair gewicht
[98]
Massa Getal
98
Categorie
Overgangsmetalen
Kleur
Zilver
Radioactief
Ja
Van het Griekse woord technetos, kunstmatig
Kristalstructuur
Eenvoudige Hexagonaal
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.
Eletronen per schil
2, 8, 18, 13, 2
Electronconfiguratie
[Kr] 4d5 5s2
Technetium was the first element to be produced artificially
Fysieke Eigenschappen
Fase
Vast
Dichtheid
11,5 g/cm3
Smeltpunt
2430,15 K | 2157 °C | 3914,6 °F
Kookpunt
4538,15 K | 4265 °C | 7709 °F
Fusiewarmte
23 kJ/mol
Verdampingswarmte
550 kJ/mol
Specifieke Warmtecapaciteit
-
Overvloedig aanwezig in de aardkorst
n.v.t.
Overvloedig aanwezig in het universum
n.v.t.
Verdiensten voor afbeeldingen: pauli.uni-muenster.de
Emilio Segrè, one of the discoverer of the element
CAS-nummer
7440-26-8
PubChem CID nummer
n.v.t.
Atoomeigenschappen
Atoomstraal
136 pm
Covalentiestraal
147 pm
Electronegativiteit
1,9 (Pauling schaal)
Ionisatiepotentiaal
7,28 eV
Atoomvolume
8,5 cm3/mol
Thermische geleiding
0,506 W/cm·K
Oxidatietoestanden
-3, -1, 1, 2, 3, 4, 5, 6, 7
Toepassingen
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
Isotopen
Stabiele isotopen
-Instabiele isotopen
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