Svojstva

CAS broj7440-39-3
PubChem CID5355457
Atomski radijus222
Atomski volumen39,24
Relativna atomska masa137,327
Bloks
Vrelište1.897
Modul stišljivosti
KategorijaZemnoalkalijski metali
Kristalna strukturaKubna prostorno centrirana
BojaSrebrna
Kovalentni radijus215
Gustoća3,594
Električna otpornost
Elektronska konfiguracija[Xe] 6s2
Elektrona po ljusci2, 8, 18, 18, 8, 2
Elektronegativnost0,89
Elektroni56
Skupina2
Toplina taljenja8
Toplina isparavanja140
Potencijal ionizacije5,212
Magnetsko redanje
Magnetska osjetljivost
Masa137,327
Maseni broj56
Talište727
NazivBarij
Neutroni81
Atomski broj137
Stanja oksidacije2
Perioda6
Agregacijsko stanjeČvrsto
Poissonov omjer
Protoni56
Modul smicanja
Specifični toplinski kapacitet0,204
SimbolBa
Toplinska vodljivost0,184
Van der Waalsov radijus
Youngov modul
Obilnost
Zastupljenost u Zemljinoj kori0.034%
Zastupljenost u svemiru1×10-6%
Ba Barij 56 137.327 2 6 s 56 725.0 1640.0 [Xe] 6s2 2 8 18 18 8 2 3.5 0.034% Silver Cubic: Body centered 0.9 0.881 {"1":"502.9","2":"965.2","3":"3600"} 508 13.95 198 2 2.22 39.0 8.01 140.2 0.204 18.4 0 Solid, Paramagnetic, Conductor, AlkalineEarthMetal, Metal, Stable, Natural BAR-i-em Soft, slightly malleable, silvery-white metal. Barite, or barium sulfate (BaSO4), when ground is used as a filter for rubber, plastics, and resins. It is insoluable in water and so is used in X-rays of the digestive system. Barium nitrate, Ba(NO3)2, burns brilliant green and is used in fireworks. Found in barytine (BaSO4) and witherite (BaCO3), never found in pure form due to its reactivity. Must be stored under kerosene to remain pure. IQ2u1JunzgA Barium
Postojanje elementa 43 predviđeno je na osnovi periodnog sustava i o njegovom otkriću pogrešno je izviješteno 1925., kada ga se imenovalo mazurij.

Element su zapravo otkrili Carlo Perrier i Emilio Segrè 1937.

Pronađen je i u uzorku molibdena koji je poslao Ernest Lawrence, a koji je bio bombardiran deuteronima u ciklotronu u Berkeleyju. Od grčke riječi technetos, umjetan 56 1808 Sir Humphrey Davy England From the Greek word "barys" meaning "heavy"

Isotopes of Technetium

Standard Atomic Weight

137.327(7)

Stabilni izotopi

130Ba 132Ba 134Ba 135Ba 136Ba 137Ba 138Ba

Nestabilni izotopi

114Ba 115Ba 116Ba 117Ba 118Ba 119Ba 120Ba 121Ba 122Ba 123Ba 124Ba 125Ba 126Ba 127Ba 128Ba 129Ba 131Ba 133Ba 139Ba 140Ba 141Ba 142Ba 143Ba 144Ba 145Ba 146Ba 147Ba 148Ba 149Ba 150Ba 151Ba 152Ba 153Ba

Technetium is harmful due to its radioactivity
Technetium was the first element to be produced artificially
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.