Техницијум
43
Tc
Група
7
Периода
5
Блок
d
Протони
Електрони
Неутрони
43
43
55
Општа својства
Атомски број
43
Атомска маса
[98]
Масени број
98
Категорија
Прелазни метали
Боја
Сребрена
Радиоактиван
Да
From the Greek word technetos, artificial
Кристална структура
Једноставни Хескагонал
Историја
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.
Електрони по љусци
2, 8, 18, 13, 2
Електронска конфигурација
[Kr] 4d5 5s2
Technetium was the first element to be produced artificially
Физичка својства
Стање
Чвсрто
Густина
11,5 g/cm3
Температура топљења
2430,15 K | 2157 °C | 3914,6 °F
Температура кључања
4538,15 K | 4265 °C | 7709 °F
Топлота топљења
23 kJ/mol
Топлота испаравања
550 kJ/mol
Специфична топлота
-
Заступљеност у Земљиној кори
н/д
Заступљеност у Космосу
н/д
CAS број
7440-26-8
ПубЦхем ЦИД број
н/д
Атомска својства
Атомски радијус
136 pm
Ковалентни радијус
147 pm
Електронегативност
1,9 (Полингова скала)
Јонизујући потенцијал
7,28 eV
Молска запремина
8,5 cm3/mol
Топлотна проводљивост
0,506 W/cm·K
Оксидациона стања
-3, -1, 1, 2, 3, 4, 5, 6, 7
Примена
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