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(So named (Greek dysprositos, "difficult of access") in 1886 by its discoverer, French chemist Paul-Émile Lecoq de Boisbaudran) A silver-white chemical element, one of the rare-earth metals, with a great capacity to absorb neutrons and with strong magnetic properties, especially at very low temperatures.

Symbol: Dy
Atomic number: 66
Atomic weight: 162.50
Density (at room temperature and pressure): 8.55 g/cc
Melting point: 1,412°C
Boiling point: 2,567°C
Valence: +3
Ground state electron configuration: [Xe]4f106s2
Symbol: Dy
Atomic Number: 66
Atomic Weight: 162.50
Boiling Point: 2840 K
Melting Point: 1685 K
Density at 300K: 8.55 g/cm3
Covalent radius: 1.59
Atomic radius: 2.49
Atomic volume: 19.0 cm3/mol
First ionization potental: 5.93 V
Specific heat capacity: 0.173 Jg-1K-1
Thermal conductivity: 10.7 Wm-1K-1
Electrical conductivity: 1.1*106Ω-1m-1
Heat of fusion: 11.06 kJ/mol
Heat of vaporization: 230 kJ/mol
Electronegativity: 1.22 (Pauling's)

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Dys*pro"si*um (?), n. [NL., fr. Gr. dyspro`sitos hard to get at.] (Chem.)

An element of the rare earth-group. Symbol Dy; at. wt., 162.5.


© Webster 1913

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