43
Tc
7
週期
5
d
個質子
電子
個中子
43
43
55
一般屬性
原子序數
43
標準原子質量
[98]
品質編號
98
類別
過渡金屬
顏色
銀色
放射性
From the Greek word technetos, artificial
晶體結構
簡單六角形
歷史
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.
每個外殼的電子
2, 8, 18, 13, 2
電子排布
[Kr] 4d5 5s2
Tc
Technetium was the first element to be produced artificially
物理性質
物態
固體
密度
11.5 g/cm3
熔點
2430.15 K | 2157 °C | 3914.6 °F
沸點
4538.15 K | 4265 °C | 7709 °F
熔化熱
23 kJ/mol
汽化熱
550 kJ/mol
比熱容
-
地殼豐度
無法計量
宇宙豐度
無法計量
Emilio
圖片來源: pauli.uni-muenster.de
Emilio Segrè, one of the discoverer of the element
CAS 編號
7440-26-8
Pubchem CID 編號
無法計量
原子性質
原子半徑
136 pm
共價半徑
147 pm
電負性
1.9 (鲍林标度)
電離電位
7.28 eV
原子體積
8.5 cm3/mol
熱導率
0.506 W/cm·K
氧化態
-3, -1, 1, 2, 3, 4, 5, 6, 7
應用
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
同位素
穩定同位素
-
不穩定同位素
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