Technetium (Tc)

General Properties

Symbol Tc
Atomic Number 43
Atomic Weight (98)
Group
7 (manganese family)
VIIA (IUPAC), VIIB (CAS)
Solid, Conductor, Transition Metal, Metal, Radioactive, Synthetic
Period 5
Block d

Physical Properties

Density 11.5 g/cm3
Atomic Volume 8.5 cm3/mole
Atomic Radius 1.36 angstroms
Covalent Radius 156 pm
Crust Abundance None
Crystal Structure Hexagonal
Color Silver

States

Melting Point 2172.0 °C
Boiling Point 4877.0 °C
Heat of Fusion 23.0 kJ/mol
Heat of Vaporization 502.0 kJ/mol

Energy

Electronegativity 1.9 (Pauling Scale)
Electron Affinity 53 kJ/mol
1st Ionization Energy 702 kJ/mol
2nd Ionization Energy 1470 kJ/mol
3rd Ionization Energy 2850 kJ/mol
Specific Heat Capacity 0.24 J g−1 K−1
Thermal Conductivity 50.6 W·m−1·K−1

Electrons & Oxidation

Oxidation States +7,4,6
Electrons Per Shell 2 8 18 13 2
Electron Configuration [Kr] 4d5 5s2
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d5 5s2
Orbital Diagram
1s
↿⇂
2s
↿⇂
2p
↿⇂
↿⇂
↿⇂
3s
↿⇂
3p
↿⇂
↿⇂
↿⇂
3d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4s
↿⇂
4p
↿⇂
↿⇂
↿⇂
4d
↿ 
↿ 
↿ 
↿ 
↿ 
4f
 
 
 
 
 
 
 
5s
↿⇂
5p
 
 
 
5d
 
 
 
 
 
5f
 
 
 
 
 
 
 

Nuclear

Radioactive Yes
Half Life 4.12×106
Lifetime 6.02×106y
Decay Beta Decay

Media

Planetary Bohr Model of Technetium (Tc)
Description
Silvery-gray metal. First synthetically produced element.
Uses
Added to iron in quantities as low as 55 part-per-million transforms the iron into a corrosion-resistant alloy.
Sources
Made first by bombarding molybdenum with deuterons (heavy hydrogen) in a cyclotron.
Pronounciation (English)
tek-NEE-shi-em

Translations

Afrikaans Technetium
Aragonese Tecnezio
العربية تكنيتيوم
Armãneashte Tehnetsiumu
Asturian Tecneciu
azərbaycan Texnesium
български Технеций
বাংলা টেকনিসিয়াম
brezhoneg Teknetiom
bosanski Tehnecij[um]
Byelorussian Тэхнецый
Cebuano Teknesyo
čeština Technecium
Chuvash Технеци
Cymraeg Tecneci
dansk Technetium
Deutsch Technetium
Ελληνικά Τεχνητιο
English Technetium
esperanto Teknecio
español Tecnecio
eesti Tehneetsium
euskara Teknezioa
فارسی تکنسیم
suomi Teknetium
føroyskt Technetium
français Technétium
Friulian Tecnezi
Western Frisian Technetium
Gaeilge Teicnéitiam
Scottish Gaelic Teicnèitiam
galego Tecnecio
ગુજરાતી ટૅક્નીશિયમનો
Gaelg Çheghnaiçhum
Hakka Thap (鎝)
עברית טכנתיום
हिंदी टेक्निशियम
hrvatski Tehnecij
magyar Technécium
հայերեն Տեխնեցիում
Bahasa Indonesia Teknetium
íslenska Teknetín
italiano Tecnezio
日本語 テクネチウム
ქართული ტექნეციუმი
کٲشُر Technet
қазақ тілі Технеций
한국어 테크네튬
Kurdish Teknesyûm
Komi Технеций
kernewek Technytyum
кыргызча Технеций
Latin Technetium
Luxembourgish Technetium
Lombard Tecnézzi
lingála Tenetu?
lietuvių Technecis
latviešu Tehnēcijs
Mari Технеций
Maori Technetium
македонски Технециум
മലയാളം ടെക്നീഷ്യം
монгол Технеци
Мокшан Текнеци
Bahasa Melayu Technetium
Malti Teknizjum, ²Teknezju
Nahuatl Tecnecio
Nederlands Technetium
norsk Technetium
Occitan Tecneci
Ossetic Технеций
polski Technet
português Tecnécio
Quechua Teknesyu
română Tehneţiu
русский Технеций
slovenčina Technécium
slovenščina Tehnecij
Samoan Teknetimi
Samogitian Teknecis
Shqip Teknec, ²Technetiumi
Српски Техницијум
Southern Sotho Teknetiamo
svenska Teknetium
Kiswahili Tekineti
தமிழ் --
Tajik Технетсий
ไทย เทคนีเชียม
Türkçe Teknesyum
Uyghur تېخېتىسىي
українська Технецій
oʻzbekcha Texnetsiy
Tiếng Việt Tecnexi
Võro Tehneetsium
中文

History

Discovered In
1937
Discovered By
Carlo Perrier, Emilio Segre
Discovered At
Italy
Word Origin
From the Greek word "technikos" meaning "artificial"