Các tính chất

CAS Number7440-39-3
PubChem CID5355457
Bán kính nguyên tử222
Nguyên tử khối39,24
Nguyên tử khối137,327
Phân lớps
Nhiệt độ sôi1.897
Bulk Modulus
Danh mụcKim loại kiềm thổ
Cấu trúc tinh thểLập phương tâm khối
Màu sắcBạc
Bán kính cộng hoá trị215
Mật độ3,594
Electrical Resistivity
Cấu hình electron[Xe] 6s2
Số electron mỗi phân lớp2, 8, 18, 18, 8, 2
Độ âm điện0,89
Nhiệt lượng nóng chảy8
Nhiệt bay hơi140
Năng lượng ion hóa5,212
Magnetic Ordering
Magnetic Susceptibility
Khối lượng137,327
Mass Number56
Nhiệt độ nóng chảy727
Nơ tron81
Số nguyên tử137
Trạng thái ôxy hóa2
Chu kỳ6
Trạng thái vật chấtRắn
Poisson Ratio
Prô ton56
Shear Modulus
Nhiệt dung0,204
Ký hiệuBa
Độ dẫn nhiệt0,184
Van der Waals radius
Young's Modulus
Hàm lượng
Hàm lượng trong vỏ trái đất0.034%
Hàm lượng trong vũ trụ1×10-6%
Ba Bari 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. ‎Từ tiếng Hy Lạp technetos, nhân tạo‎ 56 1808 Sir Humphrey Davy England From the Greek word "barys" meaning "heavy"

Đồng vị của Tecneti

Standard Atomic Weight


Các đồng vị bền

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

Các đồng vị không bền

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.