テクネチウム

43
Tc
7
周期
5
ブロック
d
陽子
電子
中性子
43
43
55
一般特性
原子番号
43
原子量
[98]
質量数
98
カテゴリ
遷移元素
銀色
放射性
はい
From the Greek word technetos, artificial
結晶構造
六方最密構造
歴史
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.
電子殻
2, 8, 18, 13, 2
電子配置
[Kr] 4d5 5s2
Tc
Technetium was the first element to be produced artificially
物理特性
固体
密度
11.5 g/㎝3
融点
2430.15 K | 2157 °C | 3914.6 °F
沸点
4538.15 K | 4265 °C | 7709 °F
融解熱
23 kJ/mol
蒸発熱
550 kJ/mol
熱容量
-
地殻中における存在比
該当なし
宇宙空間における存在比
該当なし
Emilio
画像の出典: pauli.uni-muenster.de
Emilio Segrè, one of the discoverer of the element
CAS登録番号
7440-26-8
PubChem CID Number
該当なし
原子特性
原子半径
136 pm
共有結合半径
147 pm
電気陰性度
1.9 (ポーリングの値)
イオン化エネルギー
7.28 eV
モル体積
8.5 ㎝3/mol
熱伝導率
0.506 W/㎝·K
酸化数
-3, -1, 1, 2, 3, 4, 5, 6, 7
用途
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
同位体
安定同位体
-
不安定同位体
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