Chrome (Cr)

Propriétés générales

Symbole Cr
Numéro atomique 24
Masse atomique 51.9961
Groupe
6 (Famille du chrome)
VIA (IUPAC), VIB (CAS)
Solid, Antiferromagnetic, Conductor, Transition Metal, Metal, Stable, Natural
Période 4
Bloc d

Propriétés physiques

Densité 7.19 g/cm3
Volume atomique 7.23 cm3/mole
Rayon atomique 1.3 angstroms
Rayon de covalence 127 pm
Crust Abundance 0.014%
Crystal Structure Cubic: Body centered
Color Silver

Énergie

Électronégativité 1.7 (Échelle de Pauling)
Affinité électronique 64.3 kJ/mol
Énergie de première 653 kJ/mol
2e Ionization Energy 1590.6 kJ/mol
3e Ionization Energy 2987 kJ/mol
4e Ionization Energy 4743 kJ/mol
5e Ionization Energy 6702 kJ/mol
6e Ionization Energy 8744.9 kJ/mol
7e Ionization Energy 15455 kJ/mol
8e Ionization Energy 17820 kJ/mol
9e Ionization Energy 20190 kJ/mol
10e Ionization Energy 23580 kJ/mol
11e Ionization Energy 26130 kJ/mol
12e Ionization Energy 28750 kJ/mol
13e Ionization Energy 34230 kJ/mol
14e Ionization Energy 37066 kJ/mol
15e Ionization Energy 97510 kJ/mol
16e Ionization Energy 105800 kJ/mol
17e Ionization Energy 114300 kJ/mol
18e Ionization Energy 125300 kJ/mol
19e Ionization Energy 134700 kJ/mol
20e Ionization Energy 144300 kJ/mol
21e Ionization Energy 157700 kJ/mol
22e Ionization Energy 166090 kJ/mol
23e Ionization Energy 721870 kJ/mol
24e Ionization Energy 761733 kJ/mol
Capacité thermique 0.449 J g−1 K−1
Conductivité thermique 93.7 W·m−1·K−1

Électrons et Oxydation

États d’oxydation +3,2,6
Électrons par couche 2 8 13 1
Configuration électronique [Ar] 3d5 4s1
1s2 2s2 2p6 3s2 3p6 3d5 4s1
Diagrammes d’orbitales
1s
↿⇂
2s
↿⇂
2p
↿⇂
↿⇂
↿⇂
3s
↿⇂
3p
↿⇂
↿⇂
↿⇂
3d
↿ 
↿ 
↿ 
↿ 
↿ 
4s
↿ 
4p
 
 
 
4d
 
 
 
 
 
4f
 
 
 
 
 
 
 

Nuclear

Radioactif Non

Média

Modèle planétaire de Bohr de Chrome (Cr)
Description
Very hard, crystalline, steel-gray metal. The pure metal has a blue-white color. It is hard, brittle and corrsion-resistant at normal temperatures.
Uses
Used to make stainless steel. It gives the color to rubies and emeralds. Iron-nickel-chromium alloys in various percentages yield an incredible variety of the most important metals in modern technology.
Sources
Chromite [Fe,Mg(CrO4)] is its most important mineral. Produced commercially by heating its ore in the presence of silicon or aluminium.
Pronounciation (English)
KROH-mi-em

Traductions

Afrikaans Chroom
Aragonese Cromo
العربية كروم
Armãneashte Cromu
asturianu Cromu
azərbaycan Xrom
български Хром
বাংলা ক্রোমিয়াম
brezhoneg Krom
bosanski Hrom
Byelorussian Хром
Cebuano Cromo
čeština Chrom
Chuvash Хром
Cymraeg Crom
dansk Chrom, Krom
Deutsch Chrom
Ελληνικά Χρωμιο
English Chromium
esperanto Kromo
español Cromo
eesti Kroom
euskara Kromoa
فارسی کروم
suomi Kromi
føroyskt Krom
français Chrome
furlan Crom
Frysk Groom
Gaeilge Cróimiam
Gàidhlig Cròimiam
galego Cromo
ગુજરાતી ક્રોમિયમનો
Gaelg Cromium
Hakka Chinese Kok (鉻)
עברית כרום
हिन्दी क्रोमियम
hrvatski Krom
magyar Króm
հայերեն Քրոմ
Indonesia Krom
íslenska Króm
italiano Cromo
日本語 クロム
ქართული ქრომი
کٲشُر Chróm
қазақ тілі Хром
한국어 크롬, 2크로뮴
kurdî Krom
Komi Хром
kernewek Cromyum
кыргызча Хром
Latin Chromium
Lëtzebuergesch Chrom
Lombard Cròom
lingála Kolomo
lietuvių Chromas
latviešu Hroms
Mari Хром
Māori Konukita
македонски Хром
മലയാളം ക്രോമിയം
монгол Хром
Мокшан Крома
Melayu Kromium, ²Krom
Malti Kromjum, ²Kromu
Nahuatl Tlapāltepoztli
Nederlands Chroom
norsk Krom
Occitan Crom
ирон Хром
polski Chrom
português Crómo
Runasimi Krumu
română Crom
русский Хром
slovenčina Chróm
slovenščina Krom
Samoan Kromimi
Samogitian Chruoms
shqip Krom
српски Хром
Southern Sotho Kheromiamo
svenska Krom
Kiswahili Kromi
தமிழ் குரோமியம்
тоҷикӣ Хром
ไทย โครเมียม
Türkçe Krom
ئۇيغۇرچە خروم
українська Хром
o‘zbek Xrom
Tiếng Việt Crom
Võro Kruum
中文

Histoire

Découvert en
1797
Découvert par
Louis-Nicholas Vauquelin
Découvert à/au/dans
France
Étymologie
From the Greek word "chroma" meaning "colour", named for the many coloured compounds known for chromium.