Технеций
43
Tc
Група
7
Период
5
Блок
d
Протони
Електрони
Неутрони
43
43
55
Главни свойства
Атомен номер
43
Атомна маса
[98]
Масов номер
98
Категория
Преходни метали
Цвят
Сребърен
Радиоактивни
Да
From the Greek word technetos, artificial
Кристална структура
Обикновен шестоъгълник
История
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.
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.
Електрон на обвивка
2, 8, 18, 13, 2
Електронна конфигурация
[Kr] 4d5 5s2
Technetium was the first element to be produced artificially
Физични свойства
Фаза
Твърди
Плътност
11.5 g/cm3
Температура на топене
2430.15 K | 2157 °C | 3914.6 °F
Температура на кипене
4538.15 K | 4265 °C | 7709 °F
Топлина на сливането
23 kJ/mol
Топлина на изпаряване
550 kJ/mol
Специфичен топлинен капацитет
-
Изобилие в земната кора
Неизвестно
Изобилие в вселената
Неизвестно
Номер на CAS
7440-26-8
Номер на PubChem CID
Неизвестно
Атомни свойства
Атомен радиус
136 pm
Ковалентен радиус
147 pm
Електроотрицателност
1.9 (Скала на Полинг)
Йонизационен потенциал
7.28 eV
Моларен обем
8.5 cm3/mol
Топлопроводимост
0.506 W/cm·K
Оксидационни държави
-3, -1, 1, 2, 3, 4, 5, 6, 7
Приложения
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.
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
Изотопи
Стабилни изотопи
-Нестабилни изотопи
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