Template:Infobox cobalt

{{Infobox element

|name =cobalt

|symbol =Co

|Z =27

|number =27

|abundance=

|abundance in earth's crust=

|abundance in oceans=

|abundance in solar system=

|left=iron

|right=nickel

|above=–

|below=Rh

|appearance=Hard lustrous bluish gray metal

|image name=Kobalt_electrolytic_and_1cm3_cube.jpg

|electrons per shell=2, 8, 15, 2

|phase=

|phase comment=

|density gplstp=

|density=8.834 g/cm³ 

|density conditions=(at 20° C)

|density gpcm3nrt=

|density gpcm3mp=7.75

|melting point K=1768

|melting point C=1495

|melting point F=2723

|boiling point K=3200

|boiling point C=2927

|boiling point F=5301

|triple point K=

|triple point kPa=

|critical point K=

|critical point MPa=

|heat fusion=16.06

|heat fusion 2=

|heat vaporization=377

|heat capacity=24.81

|vapor pressure 1=1790

|vapor pressure 10=1960

|vapor pressure 100=2165

|vapor pressure 1 k=2423

|vapor pressure 10 k=2755

|vapor pressure 100 k=3198

|vapor pressure comment=

|crystal structure=hexagonal close packed

|crystal structure Pearson symbol=hP2

|lattice constants=a = 250.71 pm
c = 407.00 pm (at 20 °C){{cite book |last=Arblaster |first= John W. |title=Selected Values of the Crystallographic Properties of Elements |publisher=ASM International |publication-place=Materials Park, Ohio |date=2018 |isbn=978-1-62708-155-9}}

|electronegativity=1.88

|number of ionization energies=4

|ionization energy 1=760.4

|ionization energy 2=1648

|ionization energy 3=3232

|atomic radius=125

|atomic radius calculated=

|covalent radius=Low spin: 126±3 pm
High spin: 150±7

|Van der Waals radius=

|magnetic ordering=Ferromagnetic

|electrical resistivity unit prefix=n

|electrical resistivity at 0=

|electrical resistivity at 20=62.4

|thermal conductivity=100

|thermal conductivity 2=

|thermal diffusivity=

|thermal expansion=

|thermal expansion comment={{val|12.9|e=−6}}/K (at 20 °C){{efn|text=The thermal expansion of cobalt is anisotropic: the coefficients for each crystal axis are (at 20 °C): α_a = {{val|10.9|e=−6}}/K, α_c = {{val|17.9|e=−6}}/K, and α_average = α_V/3 = {{val|12.9|e=−6}}/K.}}

|thermal expansion at 25=

|speed of sound=

|speed of sound rod at 20=4720

|speed of sound rod at r.t.=

|magnetic susceptibility=

|magnetic susceptibility ref=

|Young's modulus=209

|Shear modulus=75

|Bulk modulus=180

|Poisson ratio=0.31

|Mohs hardness=5.0

|Vickers hardness=1043

|Brinell hardness=470–3000

|CAS number=7440-48-4

|naming=from the kobelt ore, possibly named after Kobolds

|discovery and first isolation by=Georg Brandt

|discovery date=1735

|QID=Q740

}}

{{Infobox element/element navigation|symbol=Co}}