Technetium

43
Tc
Gruppe
7
Periode
5
Block
d
Protonen
Elektronen
Neutronen
43
43
55
Generelle Eigenschaften
Ordnungszahl
43
Atommasse
[98]
Massenzahl
98
Kategorie
Übergangsmetalle
Farbe
Silber
Radioaktiv
Ja
Aus dem Griechischen technetos (künstlich)
Kristallstruktur
Einfach hexagonal
Geschichte
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.
Elektronen pro Schale
2, 8, 18, 13, 2
Elektronenkonfiguration
[Kr] 4d5 5s2
Tc
Technetium was the first element to be produced artificially
Physikalische Eigenschaften
Aggregatzustand
Fest
Dichte
11,5 g/cm3
Schmelzpunkt
2430,15 K | 2157 °C | 3914,6 °F
Siedepunkt
4538,15 K | 4265 °C | 7709 °F
Schmelzwärme
23 kJ/mol
Verdampfungswärme
550 kJ/mol
Spezifische Wärmekapazität
-
Häufigkeit in der Erdkruste
n/a
Häufigkeit im Universum
n/a
Emilio
Danksagungen für Bilder: pauli.uni-muenster.de
Emilio Segrè, one of the discoverer of the element
CAS-Nummer
7440-26-8
PubChem CID Number
n/a
Atomeigenschaften
Atomradius
136 pm
Kovalenter Radius
147 pm
Elektronegativität
1,9 (Pauling-Skala)
Ionisierungsenergie
7,28 eV
Molares Volumen
8,5 cm3/mol
Wärmeleitfähigkeit
0,506 W/cm·K
Oxidationszustände
-3, -1, 1, 2, 3, 4, 5, 6, 7
Anwendung
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.
Technetium is harmful due to its radioactivity
Isotope
Stabile Isotope
-
Instabile Isotope
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