Iridium (Ir)

General Properties

Symbol Ir
Atomic Number 77
Atomic Weight 192.217
Group
9 (cobalt family)
VIIIA (IUPAC), VIII (CAS)
Solid, Paramagnetic, Conductor, Transition Metal, Metal, Stable, Natural
Period 6
Block d

Physical Properties

Density 22.4 g/cm3
Atomic Volume 8.54 cm3/mole
Atomic Radius 1.36 angstroms
Covalent Radius --
Crust Abundance 4E-8%
Crystal Structure Cubic: Face centered
Color Silver

Energy

Electronegativity 2.2 (Pauling Scale)
Electron Affinity 151 kJ/mol
1st Ionization Energy 880 kJ/mol
2nd Ionization Energy 1600 kJ/mol
Specific Heat Capacity 0.13 J g−1 K−1
Thermal Conductivity 147.0 W·m−1·K−1

Electrons & Oxidation

Oxidation States +4,3,6
Electrons Per Shell 2 8 18 32 15 2
Electron Configuration [Xe] 4f14 5d7 6s2
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d7 6s2
Orbital Diagram
1s
↿⇂
2s
↿⇂
2p
↿⇂
↿⇂
↿⇂
3s
↿⇂
3p
↿⇂
↿⇂
↿⇂
3d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4s
↿⇂
4p
↿⇂
↿⇂
↿⇂
4d
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
4f
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
↿⇂
5s
↿⇂
5p
↿⇂
↿⇂
↿⇂
5d
↿⇂
↿⇂
↿ 
↿ 
↿ 
5f
 
 
 
 
 
 
 
6s
↿⇂
6p
 
 
 
6d
 
 
 
 
 
6f
 
 
 
 
 
 
 

Nuclear

Radioactive No

Media

Planetary Bohr Model of Iridium (Ir)
Description
Heavy, brittle, white metal.
Uses
Used with osmium to tip gold pen points, to make crucible and special containers. Also to make alloys used for standard weights and measures, and heat-resistant alloys. Also as hardening agent for platinum.
Sources
Found in gravel deposits with platinum.
Pronounciation (English)
i-RID-i-em

Translations

Afrikaans Iridium
Aragonese Iridio
العربية إريديوم
Armãneashte Iridiumu
asturianu Iridiu
azərbaycan dili İridium
български Иридий
বাংলা ইরিডিয়াম
brezhoneg Iridiom
bosanski Iridij[um]
Byelorussian Iрыдый
Cebuano Iridyo
čeština Iridium
Chuvash Ириди
Cymraeg Iridi
dansk Iridium
Deutsch Iridium
Ελληνικά Ιριδιο
English Iridium
esperanto Iridio
español Iridio
eesti Iriidium
euskara Iridioa
فارسی ایریدیم
suomi Iridium
føroyskt Iridium
français Iridium
furlan Iridi
West-Frysk Iridium
Gaeilge Iridiam
Gàidhlig Iridiam
galego Iridio
ગુજરાતી ઇરિડિયમનો
Gaelg Iriddjum
Hakka Chinese Yî (銥)
עברית אירידיום
हिन्दी इरिडियम
hrvatski Iridij
magyar Irídium
հայերեն Իրիդիում
Indonesia Iridium
íslenska Iridín
italiano Iridio
日本語 イリジウム
ქართული ირიდიუმი
کٲشُر Jirid
қазақ тілі Иридий
한국어 이리듐
Kurdish Îrîdyûm
Komi Иридий
kernewek Yrydyum
кыргызча Иридий
Latin Iridium
Lëtzebuergesch Iridium
Lombard Irídi
lingála Ilidu
lietuvių Iridis
latviešu Irīdijs
Mari Иридий
Maori Iridium
македонски Иридиум
മലയാളം ഇറിഡിയം
монгол Ириди
Мокшан Ириди
Bahasa Melayu Iridium
Malti Iridju[m]
Nahuatl Iridio
Nederlands Iridium
norsk Iridium
Occitan Iridi
ирон Иридий
polski Iryd
português Irídio
Runasimi Iridyu
română Iridiu
русский Иридий
slovenčina Iridium
slovenščina Iridij
Samoan Iridimi
Samogitian Ėrėdis
shqip Irid, ²Iridiumi
српски Иридијум
Southern Sotho Iridiamo
svenska Iridium
Kiswahili Iridi
தமிழ் இரிடியம்
Tajik Иридий
ไทย อิริเดียม
Türkçe İridyum
ئۇيغۇرچە ئىرىدىي
українська Iридій
o‘zbek Iridiy
Tiếng Việt Iriđi
Võro Iriidium
中文

History

Discovered In
1803
Discovered By
Smithson Tennant, Antoine Fourcroy, Louis Vanquelin, Hippolyte Collet-Descotils
Discovered At
England, France
Word Origin
From the Greek word "iris" meaning "rainbow"