Technetium

43
Tc
Gruppe
7
Periode
5
Blok
d
Protons
Electrons
Neutrons
43
43
55
General Properties
Atomnummer
43
Atommasse
[98]
Mass Number
98
Kategori
Overgangsmetaller
Farve
Silver
Radioactive
Ja
From the Greek word technetos, artificial
Krystalstruktur
Simpel Hexagonal
History
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.
Elektroner i hver skal
2, 8, 18, 13, 2
Elektronkonfiguration
[Kr] 4d5 5s2
Tc
Technetium was the first element to be produced artificially
Physical Properties
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
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
Emilio
Billede akkrediteringer: pauli.uni-muenster.de
Emilio Segrè, one of the discoverer of the element
CAS Number
7440-26-8
PubChem CID Number
n/a
Atomic Properties
Atomradius
136 pm
Kovalent radius
147 pm
Elektronegativitet
1,9 (Paulings skala)
Ionization Potential
7,28 eV
Atomic Volume
8,5 cm3/mol
Varmeledningsevne
0,506 W/cm·K
Oxidationstrin
-3, -1, 1, 2, 3, 4, 5, 6, 7
Applications
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
Isotoper
Stable Isotopes
-
Unstable Isotopes
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