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Atomic Number	66

Atomic Symbol	Dy

Atomic Weight	162.50 amu

Group	Rare Earth (Lanthanide Series)

Form	Solid

Density @ STP	8.55 g/cm³

Melting Point	1412 °C (2573.6 °F, 1685.15 °K)

Boiling Point	2567 °C (4652.6 °F, 2840.15 °K)

Heat of Fusion	11.06 kJ/mol

Heat of Vaporization	280 kJ/mol

First Ionization Potential	5.9389 eV

Electronegativity (on Pauling scale	1.22

Specific Heat Capacity	0.170 J/g K

Ground State Electron Configuration	4f¹⁰ 5s² 5p⁶ 6s²

Oxidation State(s)	+3

Stable Isotopes and Natural Abundance on Earth	¹⁵⁶Dy, 0.06%; ¹⁵⁸Dy, 0.10%; ¹⁶⁰Dy, 2.34%; ¹⁶¹Dy, 18.9%; ¹⁶²Dy, 25.5%; ¹⁶³Dy, 24.9%; ¹⁶⁴Dy, 28.2%

Selected Radioisotopes	¹⁶⁵Dy, ¹⁶⁶Dy

Atomic Radius	228 pm

Crystal Structure	Hexagonal

Discovered by	Lecoq de Boisbaudran, 1886