Właściwości

CAS Number7440-39-3
PubChem CID5355457
Promień atomowy222
Objętość molowa39,24
Masa atomowa137,327
Bloks
Temperatura wrzenia1 897
Bulk Modulus
KategoriaMetale ziem alkalicznych
Układ krystalograficznyBody Centered Cubic
KolorSrebrny
Promień walencyjny215
Gęstość3,594
Rezystancja
Konfiguracja elektronowa[Xe] 6s2
Elektrony na poszczególnych powłokach2, 8, 18, 18, 8, 2
Elektroujemność0,89
Elektrony56
Grupa2
Ciepło topnienia8
Ciepło parowania140
Energia jonizacji5,212
Magnetic Ordering
Magnetic Susceptibility
Masa137,327
Liczba masowa56
Temperatura topnienia727
NazwaBar
Neutrony81
Liczba atomowa137
Stopnie utlenienia2
Okres6
Stan skupieniaCiało stałe
Poisson Ratio
Protony56
Shear Modulus
Ciepło właściwe0,204
SymbolBa
Przewodność cieplna0,184
Van der Waals radius
Moduł Younga
Obfitość
Ilość w skorupie Ziemi0.034%
Ilość we Wszechświecie1×10-6%
Ba Bar 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
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. From the Greek word technetos, artificial 56 1808 Sir Humphrey Davy England From the Greek word "barys" meaning "heavy"

Isotopes of Technetium

Standard Atomic Weight

137.327(7)

Stabilne izotopy

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

Niestabilne izotopy

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.