Tecneci

43
Tc
Grup
7
Període
5
Bloc
d
Protons
Electrons
Neutrons
43
43
55
Propietats Generals
Nombre atòmic
43
Massa atòmica
[98]
Mass Number
98
Categoria
Metalls de transició
Color
Plata
Radioactiu
From the Greek word technetos, artificial
Estructura cristal·lina
Hexàgon simple
Història
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.
Electrons per capa
2, 8, 18, 13, 2
Configuració electrònica
[Kr] 4d5 5s2
Tc
Technetium was the first element to be produced artificially
Propietats Físiques
Fase
Sòlid
Densitat
11,5 g/cm3
Punt de fusió
2430,15 K | 2157 °C | 3914,6 °F
Punt d'ebullició
4538,15 K | 4265 °C | 7709 °F
Entalpia de fusió
23 kJ/mol
Entalpia de vaporització
550 kJ/mol
Capacitat tèrmica específica
-
Abundància a l'escorça terrestre
n/a
Abundància a l'univers
n/a
Emilio
Crèdits de les imatges: pauli.uni-muenster.de
Emilio Segrè, one of the discoverer of the element
CAS Number
7440-26-8
PubChem CID Number
n/a
Propietats Atòmiques
Radi atòmic
136 pm
Radi covalent
147 pm
Electronegativitat
1,9 (Escala de Pauling)
Potencial d'ionització
7,28 eV
Volum atòmic
8,5 cm3/mol
Conductivitat tèrmica
0,506 W/cm·K
Estats d'oxidació
-3, -1, 1, 2, 3, 4, 5, 6, 7
Aplicacions
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
Isòtops
Isòtops estables
-
Isòtops inestables
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