Template:Infobox dysprosium

Dysprosium,  ₆₆Dy

General properties
Name, symbol	dysprosium, Dy
Appearance	silvery white
Pronunciation	/dɪsˈproʊziəm/ dis-PROH-zee-əm
Dysprosium in the periodic table
– ↑ Dy ↓ Cf terbium ← dysprosium → holmium
Atomic number (Z)	66
Group, block	group n/a, f-block
Period	period 6
Element category	lanthanide
Standard atomic weight (±) (Ar)	162.500(1)
Electron configuration	[Xe] 4f10 6s2
per shell	2, 8, 18, 28, 8, 2
Physical properties
Phase	solid
Melting point	1680 K ​(1407 °C, ​2565 °F)
Boiling point	2840 K ​(2562 °C, ​4653 °F)
Density near r.t.	8.540 g/cm3
when liquid, at m.p.	8.37 g/cm3
Heat of fusion	11.06 kJ/mol
Heat of vaporization	280 kJ/mol
Molar heat capacity	27.7 J/(mol·K)
vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1378 1523 (1704) (1954) (2304) (2831)
Atomic properties
Oxidation states	4, 3, 2, 1 ​(a weakly basic oxide)
Electronegativity	Pauling scale: 1.22
Ionization energies	1st: 573.0 kJ/mol 2nd: 1130 kJ/mol 3rd: 2200 kJ/mol
Atomic radius	empirical: 178 pm
Covalent radius	192±7 pm
Miscellanea
Crystal structure	​hexagonal close-packed (hcp)
Speed of sound thin rod	2710 m/s (at 20 °C)
Thermal expansion	α, poly: 9.9 µm/(m·K) (r.t.)
Thermal conductivity	10.7 W/(m·K)
Electrical resistivity	α, poly: 926 nΩ·m (r.t.)
Magnetic ordering	paramagnetic at 300 K
Young's modulus	α form: 61.4 GPa
Shear modulus	α form: 24.7 GPa
Bulk modulus	α form: 40.5 GPa
Poisson ratio	α form: 0.247
Vickers hardness	410–550 MPa
Brinell hardness	500–1050 MPa
CAS Number	7429-91-6
History
Discovery	Lecoq de Boisbaudran (1886)
Most stable isotopes of dysprosium
iso NA half-life DM DE (MeV) DP 154Dy syn 3.0×106 y α 2.947 150Gd 156Dy 0.06% >1×1018 y (α) 1.7579 152Gd (β+β+) 2.0108 156Gd 158Dy 0.10% – (α) 0.8748 154Gd (β+β+) 0.2833 158Gd 160Dy 2.34% – (α) 0.4387 156Gd 161Dy 18.91% – (α) 0.3443 157Gd 162Dy 25.51% – (α) 0.0847 158Gd 163Dy 24.90% – (SF) <79.055 164Dy 28.18% – (SF) <79.499
Decay modes in parentheses are predicted, but have not yet been observed

References

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