Technețiu
43
Tc
Grupă
7
Perioadă
5
Bloc
d
Protoni
Electroni
Neutroni
43
43
55
Proprietăți Generale
Număr atomic
43
Masă atomică
[98]
Numar de masa
98
Categorie
Metale de tranziție
Culoare
Argint
Radioactive
Da
Din cuvântul grecesc technetos, artificial
Structură cristalină
Sistemul Hexagonal
Istoric
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.
Electroni pe nivelul de energie
2, 8, 18, 13, 2
Configurație electronică
[Kr] 4d5 5s2
Technetium was the first element to be produced artificially
Proprietăți Fizice
Fază
Solid
Densitate
11,5 g/cm3
Punct de topire
2430,15 K | 2157 °C | 3914,6 °F
Punct de fierbere
4538,15 K | 4265 °C | 7709 °F
Energie de fuziune
23 kJ/mol
Energie de evaporare
550 kJ/mol
Căldură specifică
-
Abundența în scoarța Pământului
n/a
Abundența în Univers
n/a
Numarul CAS
7440-26-8
Număr CID PubChem
n/a
Proprietăți Atomice
Rază atomică
136 pm
Rază de covalență
147 pm
Electronegativitate
1,9 (Scara lui Pauling)
Potențial de ionizare
7,28 eV
Volum molar
8,5 cm3/mol
Conductivitate termică
0,506 W/cm·K
Număr de oxidare
-3, -1, 1, 2, 3, 4, 5, 6, 7
Aplicații
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
Izotopi
Izotopi stabili
-Izotopi instabili
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