Template:Infobox erbium

{{Infobox element

|symbol =Er

|Z =68

|number =68

|name =erbium

|abundance=

|abundance in earth's crust=

|abundance in oceans=

|abundance in solar system=

|left=holmium

|right=thulium

|above=–

|below=Fm

|image name=Erbium (68 Er).jpg

|image upright=0.75

|appearance=silvery white

|electrons per shell=2, 8, 18, 30, 8, 2

|phase=

|density=9.065 g/cm³

|density conditions=(at 20° C)

|density gpcm3mp=8.86

|melting point K=1802

|melting point C=1529

|melting point F=2784

|boiling point K=3141

|boiling point C=2868

|boiling point F=5194

|heat fusion=19.90

|heat vaporization=280

|heat capacity=28.12

|vapor pressure 1=1504

|vapor pressure 10=1663

|vapor pressure 100=(1885)

|vapor pressure 1 k=(2163)

|vapor pressure 10 k=(2552)

|vapor pressure 100 k=(3132)

|vapor pressure comment=

|crystal structure=hexagonal close packed

|crystal structure Pearson symbol=hP2

|lattice constants=a = 355.93 pm
c = 558.49 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=1.24

|number of ionization energies=3

|ionization energy 1=589.3

|ionization energy 2=1150

|ionization energy 3=2194

|atomic radius=176

|covalent radius=189±6

|magnetic ordering= paramagnetic at 300 K

|electrical resistivity unit prefix=µ

|electrical resistivity=poly: 0.860

|electrical resistivity comment=({{abbr|r.t.|room temperature}})

|thermal conductivity=14.5

|thermal expansion=poly: 12.2

|thermal expansion comment=({{abbr|r.t.|room temperature}})

|speed of sound rod at 20=2830

|magnetic susceptibility= {{val|+44,300.00|e=−6}}

|magnetic susceptibility ref= {{Cite book|title=CRC, Handbook of Chemistry and Physics|last=Weast|first=Robert|publisher=Chemical Rubber Company Publishing|year=1984|isbn=0-8493-0464-4|location=Boca Raton, Florida|pages=E110}}

|Young's modulus=69.9

|Shear modulus=28.3

|Bulk modulus=44.4

|Poisson ratio=0.237

|Vickers hardness=430–700

|Brinell hardness=600–1070

|CAS number=7440-52-0

|naming=after Ytterby (Sweden), where it was mined

|discovered by=Carl Gustaf Mosander

|discovery date=1843

|first isolation by=Wilhelm Klemm and Heinrich Bommer

|first isolation date=1934

|QID=Q1849

}}