Teknetium
43
Tc
Ryhmä
7
Jakso
5
Lohko
d
Protonia
Elektronit
Neutronia
43
43
55
Yleiset ominaisuudet
Järjestysluku
43
Atomipaino
[98]
Massaluku
98
Luokka
Siirtymäalkuaineet
Väri
Hopea
Radioaktiivisuus
Kyllä
From the Greek word technetos, artificial
Kiderakenne
Yksinkertainen kuusikulmainen
Historia
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.
Elektroneja elektronikuorilla
2, 8, 18, 13, 2
Orbitaalirakenne
[Kr] 4d5 5s2
Technetium was the first element to be produced artificially
Fyysiset ominaisuudet
Olomuoto
Kiinteä
Tiheys
11,5 g/cm3
Sulamispiste
2430,15 K | 2157 °C | 3914,6 °F
Kiehumispiste
4538,15 K | 4265 °C | 7709 °F
Sulamislämpö
23 kJ/mol
Höyrystymislämpö
550 kJ/mol
Ominaislämpökapasiteetti
-
Esiintyvyys maankuoressa
Ei saatavilla
Esiintyvyys maailmankaikkeudessa
Ei saatavilla
CAS-numero
7440-26-8
PubChem CID-numero
Ei saatavilla
Atomiominaisuudet
Atomisäde
136 pm
Kovalenttisäde
147 pm
Elektronegatiivisuus
1,9 (Paulingin asteikko)
Ionisoitumispotentiaali
7,28 eV
Moolitilavuus
8,5 cm3/mol
Lämmönjohtavuus
0,506 W/cm·K
Hapetusluvut
-3, -1, 1, 2, 3, 4, 5, 6, 7
Käyttö
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
Isotooppi
Vakaat isotoopit
-Epävakaat isotoopit
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