Holmyo

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Holmium
67Ho
-

Ho

Es
dysprosiumholmiumerbium
Appearance
silvery white
General properties
Name, simbolo, kaiphan holmium, Ho, 67
Pronunciation Plantilya:IPAc-en Plantilya:Respell
Element category puthaw nga lantanido
Group, period, block n/a6, f
Standard atomic weight 164.93032
Electron configuration [Xe] 4f11 6s2
2, 8, 18, 29, 8, 2
Electron shells of holmium (2, 8, 18, 29, 8, 2)
History
Discovery Marc Delafontaine (1878)
Physical properties
Phase magahi
Density (near r.t.) 8.79 g·cm−3
Liquid density at m.p. 8.34 g·cm−3
Melting point 1734 K, 1461 °C, 2662 °F
Boiling point 2993 K, 2720 °C, 4928 °F
Heat of fusion 17.0 kJ·mol−1
Heat of vaporization 265 kJ·mol−1
Molar heat capacity 27.15 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1432 1584 (1775) (2040) (2410) (2964)
Atomic properties
Oxidation states 3, 2, 1

(basic oxide)

Electronegativity 1.23 (Pauling scale)
Ionization energies 1st: 581.0 kJ·mol−1
2nd: 1140 kJ·mol−1
3rd: 2204 kJ·mol−1
Atomic radius 176 pm
Covalent radius 192±7 pm
Miscellanea
Crystal structure hexagonal
Holmium has a hexagonal crystal structure
Magnetic ordering paramagnetic
Electrical resistivity (r.t.) (poly) 814 nΩ·m
Thermal conductivity 16.2 W·m−1·K−1
Thermal expansion (r.t.) (poly) 11.2 µm/(m·K)
Speed of sound (thin rod) (20 °C) 2760 m·s−1
Young's modulus 64.8 GPa
Shear modulus 26.3 GPa
Bulk modulus 40.2 GPa
Poisson ratio 0.231
Vickers hardness 481 MPa
Brinell hardness 746 MPa
CAS registry number 7440-60-0
Most stable isotopes
Main article: Isotopes of holmium
iso NA half-life DM DE (MeV) DP
163Ho syn 4570 yr ε 0.003 163Dy
164Ho syn 29 min ε 0.987 164Dy
165Ho 100% 165Ho is stable with 98 neutrons
166Ho syn 26.763 h β 1.855 166Er
167Ho syn 3.1 h β 1.007 167Er
t  h  u
· r

Ang holmyo (Iningles holmium) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Ho ug kaiphan nga atomik 67. Ang holmyo mao ang puthaw nga lantanido.

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