Tehnecij

43
Tc
Skupina
7
Perioda
5
Blok
d
Protons
Electrons
Neutrons
43
43
55
General Properties
Vrstno število
43
Atomska teža
[98]
Mass Number
98
Kategorija
Prehodne kovine
Barva
Silver
Radioactive
Da
From the Greek word technetos, artificial
Kristalna struktura
Heksagonalna
Zgodovina
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 shell
2, 8, 18, 13, 2
Razporeditev elektronov
[Kr] 4d5 5s2
Tc
Technetium was the first element to be produced artificially
Physical Properties
Faza snovi
Trdnina
Gostota
11,5 g/cm3
Tališče
2430,15 K | 2157 °C | 3914,6 °F
Vrelišče
4538,15 K | 4265 °C | 7709 °F
Talilna toplota
23 kJ/mol
Izparilna toplota
550 kJ/mol
Toplotna kapaciteta
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
Emilio
Zasluge za slike: 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
Atomski polmer
136 pm
Kovalentni polmer
147 pm
Elektronegativnost
1,9 (Paulingova lestvica)
Ionization Potential
7,28 eV
Atomic Volume
8,5 cm3/mol
Toplotna prevodnost
0,506 W/cm·K
Oksidacijska stanja
-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
Isotopes
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